This is a text-only command.
Type the text equivalent at the command prompt
Freezing a layer is the same as "write-protecting" that layer. You can see entities on frozen layers and refer to them with modifiers, but you can't select them for edit or copy operations.
FREEZE ALL freezes (write-protects) all but the current layer. Use this command if you need to freeze all but the current layer at once. In many cases, You may find it more convenient than the Select Layer dialog box.
To freeze a single layer:
Use the FREEZE command (Options > Layer Options > Freeze).
To thaw (un-freeze) all frozen layers:
Use the THAW ALL command (Options > Layer Options > Thaw All).
Text equivalent: FREEZEA