I have planar project on almost all the time. Usually I’m working with rectilinear objects and I’ve gotten used to this serving the process. But from time to time I need to to turn them off for a particular task. I often forget to turn them back on afterward and end up making a big mess for a while before I figure that out. I wonder if there’s a way of reminding me that it’s off. Maybe the interface can in some way change to reflect planar project being off to remind me? Or something like that? Maybe I need to just put a post it note on my monitor…
i am afraid there is not much you can do besides training yourself to work accurate and consistent and checking your settings before you get ahead of yourself 
what might help a little is if you use this macro ProjectOsnap enable enter and throw it into your general options into the command list “run these commands every time a model is opened” it will automatically activate project regardless in which state the setting is for each new file you open.
also, when you create a mess and the curves are elevated instead of sticky to xy plane, then you can use ProjectToCPlane to flatten it all out again.
Hi @djhg
Planar is easy to spot if it’s on or off as it’s listed on the bottom bar. It will be highlighted if it’s on and not highlighted when it’s off.
For project you could make or take the “toggle project icon” and place or copy the icon where you can see it, then click on it now and then, the command line will report if project is on or off.
'_ProjectOSnap _Toggle
Also check the bottom of the osnaps where there is a slot to turn project on and off. I usually have my osnaps floating and open so I can see my options at a glance.
RM
as others said above
work concentrated and be aware of the planar project status - best approach.
alternative setttings
under options → Rhino → Modelling Aids → Objects Snaps
…
there is a setting
“Project Object Snaps to CPlane in plan parallel views”
this might fit to your workflow.
brutal macro
if you really need some feedback - the only thing i am thinking of - do a macro that indicates planar status with background color. super brutal version.
So instead of using standard tools, put those macros to a button or a shortcut/alias
turn planar on → white Background
_-Options _Appearance _Colors _Custom _Viewport _Background=255,255,255 _EnterEnd _setPlanar _on
turn planar of → black Background
_-Options _Appearance _Colors _Custom _Viewport _Background=0,0,0, _EnterEnd _setPlanar _off
options appearance Viewportcolor → restore default as backup…
kind regards -tom
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Thanks Folks!