An architectural drawing has dozens of layers: grids, walls, doors, dimensions, notes, furniture. When you only need a few, the fastest way to tidy the screen is to hide layers in AutoCAD. There are two ways: turn them off, or freeze them. On screen the two look identical, but AutoCAD treats them very differently, and one of the differences can cost you geometry.
This article tries both in AutoCAD 2027 with the acadiso.dwt template, using two layers, A and B, far apart. Layers in general, the Layer Properties Manager and its state columns are covered in layers in AutoCAD; deleting layers is in deleting layers. For drafting taught properly, the Institute runs an AutoCAD course for construction.
Commands for hiding layers
| Job | Command | Ribbon |
|---|---|---|
| Turn off the layer of a picked object | LAYOFF | Home → Layers → Off |
| Turn all off layers back on | LAYON | Home → Layers → Turn All Layers On |
| Freeze the layer of a picked object | LAYFRZ | Home → Layers → Freeze |
| Thaw all layers | LAYTHW | Home → Layers → Thaw All Layers |
| Off, on, freeze, thaw by name | -LAYER → OFF, ON, F, T |
Locations come from the 2027 acad.cuix file. LAYOFF asks Select an object on the layer to be turned off or [Settings/Undo]:. Before that prompt it prints its current settings, Current settings: Viewports=Off, Block nesting level=Block, which the Settings option lets you change. Click an actual line and its layer turns off at once. Click empty space inside a rectangle and AutoCAD says Nothing Selected.
Pick a line on layer A and then one on layer B and both turn off. The layon command replies All layers have been turned on. and both come back.
Turn off a layer: hidden but still there
Layer B holds a rectangle 50 000 units away from layer A. Turn off layer B and try the two most common operations:
| Operation | B on | B off |
|---|---|---|
Type ALL at a selection prompt | 2 objects selected | still 2, including B's rectangle |
ZOOM → Extents | View height 25 474 | still 25 474, B still counted |
25 474 is the view height after ZOOM Extents, enough to contain both rectangles 50 000 units apart. With only layer A's rectangle, about 1 000 would do: the screen has shrunk more than twentyfold to make room for something you cannot see.
Objects on an off layer are hidden from your eyes only; to AutoCAD they are still there. The first consequence is dangerous: erasing with ALL erases objects on off layers too, even though you cannot see them. The second is irritating: ZOOM Extents shrinks the drawing to make room for lines you cannot see.
Freeze a layer: truly hidden
Same layer B, this time frozen (-LAYER → F) instead of turned off, then the same two operations.
| Operation | B frozen |
|---|---|
Type ALL | Only 1 object; B's rectangle is not selected |
ZOOM → Extents | View height 1 012, only layer A's rectangle |
The Autodesk documentation on LAYFRZ says objects on frozen layers are invisible, and that in large drawings freezing unneeded layers speeds up display and regeneration. The results above show more. A frozen layer is ignored entirely: it is not shown, not picked by ALL, and not counted by ZOOM Extents. The two numbers make the difference concrete: one object selected instead of two, and a view 1 012 high instead of 25 474. On a real drawing with dozens of far-flung objects on hidden layers, that is the difference between a usable ZOOM Extents and one that shows a speck in the corner of the screen. Thaw it (-LAYER → T) and everything returns: ALL picks 2, ZOOM Extents gives 25 474 again.
The current layer: can be turned off, cannot be frozen
Layer A is current. Try to turn it off and to freeze it:
| Operation on the current layer | The 2027 reply |
|---|---|
-LAYER → OFF → A | Asks Really want layer "A" (the CURRENT layer) off? <N> |
-LAYER → F → A | Refuses: Cannot freeze layer "A". It is the CURRENT layer. |
Answer Y and layer A turns off while staying current. Draw a line: it is created, on layer A, but not shown. The user thinks the command failed and draws again, and the drawing collects overlapping lines nobody can see. That is why the default answer is <N>: pressing Enter out of habit leaves the layer on. If you ever find a drawing where lines seem to vanish as you draw them, check whether the current layer is off before suspecting anything else; it is the simplest explanation and the quickest to fix.
Freezing is stricter: no question, just a refusal, and layer A stays as it was. Set the current layer to 0 and repeat -LAYER → F → A, and this time layer A freezes normally.
Showing layers again: LAYON and LAYTHW
The two ways of hiding need two ways of showing:
| Hidden by | Shown again by |
|---|---|
Off (LAYOFF, -LAYER → OFF) | LAYON, or -LAYER → ON |
Frozen (LAYFRZ, -LAYER → F) | LAYTHW, or -LAYER → T |
They do not substitute for each other. Freeze layer B and type LAYON: B stays frozen, even though the command replies that all layers have been turned on. The message is literally true, since B was never off, but it is easy to read as "everything is visible again" when it is not. Only the laythw command thaws it. So if LAYON does not bring a layer back, it is almost certainly frozen rather than off.
Which to use
| Situation | Use | Why |
|---|---|---|
| Hide for a few seconds to see clearly | Off | One LAYON brings it back |
| Hide for a long time, especially far-away geometry | Freeze | ZOOM Extents is not stretched |
About to erase in bulk with ALL | Freeze the layers to keep | Off layers are still picked by ALL |
| The layer is current | Change the current layer first | You can turn it off, but new lines will not show |
Isolating one layer, keeping only what you need, has its own command, LAYISO; how it fades and locks the others is in layers in AutoCAD.
Before erasing in bulk: a safe order
- Open the Layer Properties Manager and read the On and Freeze columns of every layer.
- Any layer that is off but must keep its objects: freeze it instead.
- Only now select with
ALL. What is selected is exactly what you intend to process. - When done,
LAYTHWto thaw, thenLAYONto turn the off layers back on.
Do the same before using ZOOM Extents: an off layer with objects far away pulls the view out, away from the part of the drawing you can actually see. The same check explains a common puzzle when a drawing arrives from someone else. If ZOOM Extents leaves your geometry tiny in one corner, look for layers that are off; freezing them brings the extents back to what is visible.
The order matters because each step changes what the next one sees. Freezing before selecting keeps the frozen objects out of the selection; thawing afterwards and then turning layers on returns the drawing to the state you received it in, with nothing lost and nothing selected by accident.
| Step | Command | Effect on ALL |
|---|---|---|
| Freeze the layers to keep | LAYFRZ or -LAYER → F | Their objects are no longer picked |
| Select and process | ALL at the selection prompt | Objects on every unfrozen layer, including off ones |
| Restore | LAYTHW, then LAYON | Everything selectable again |
Three things often repeated that are not true
| Often repeated | What holds on the 2027 release |
|---|---|
| Objects on an off layer are safe | ALL still selects them |
| Off and Freeze only differ in speed | They also differ in selection and ZOOM Extents |
| LAYON brings back every hidden layer | LAYON does not thaw; frozen layers need LAYTHW |
Frequently asked questions
How do I hide layers in AutoCAD?
LAYOFF and pick a line on the layer. To hide it from ZOOM Extents and from ALL too, use LAYFRZ.
How do I show hidden layers again?
LAYON for layers turned off, LAYTHW for frozen ones. Neither does the other's job.
Why does ZOOM Extents make the drawing tiny on an empty screen?
An off layer has objects far away. Freeze that layer instead of turning it off.
Why can't I see what I draw?
The current layer is off. Turn it on, or switch to another layer.
Does turning a layer off protect its objects?
No. An erase with ALL still picks objects on off layers.
Can I freeze the current layer?
No. AutoCAD says Cannot freeze layer ... It is the CURRENT layer. Change the current layer first.