Is there a way to hide a drawing layer?

One option is to capture the contents of the drawings using SetDrawEnv gstart, name=... (your drawing commands) SetDrawEnv gstop. You can delete or restore this captured environment as you need. As an easier approach, you might consider drawing a non-transparent box on top of the existing items to hide them, and then remove the box cover as needed to unhide them.

You can also use

to save the commands needed to redraw a layer, then

to delete the layer.

To recreate the layer, step through the lines of s_recreation and execute each in sequence:

function RecreateLayer(string s_recreation)
    wave/T w = ListToTextWave(s_recreation, "\r")
    for (string s : w)
        Execute s
    endfor
end