I noticed that in 2.91 X-Ray mode automatically toggles when you switch from Object to Edit mode. I haven’t found the preferences where I could adjust this behaviour. Anyone knows what’s happening here?
Thank you in advance! 
It shouldn’t. Are you sure it’s an actual toggle and not a visual glitch?
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Yep, it’s a full toggle…
It certainly doesn’t do that if you just switch modes. I’d look into whichever custom menu you’re using, perhaps they’re in need of updating.
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Hm, yea, I am using Machin3 tools, I’ll try without…
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Verified, it’s the Machin3tools that need updating… already gotten so used to it… Thank you! 
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Have you figured out a solution to this?
bump, got same problem, thx
Just throwing this out incase someone comes to the thread like I had looking for an answer.
The solution is as follows:
- Go into edit mode
- Open the Machine Tools shading menu
- Press W or click on the “Wireframe” button
This should return the viewport to how it’s supposed to look. Make sure you’re in edit mode when you do this. It looks like this functions how you’d expect in object mode but in edit mode, it turns on x-ray shader and it will keep turning it back on until you click on that Wireframe button in edit mode.
Hope it helps!
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Might be a lame question, but how do you open machine tools shading menu?
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Machin3
1 - TAB to go to EDIT MODE
2 - TAB - between face and edge select PASSTHROUGH
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