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You cannot
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The colors are fixed in the RC version (you can use that or just wait for next Rhino release)
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You can right-click on the standalone toolbar window (in your screenshot, the third window, on the right), the click on properties (or something similar) and choose the text+icon option.
Be careful:
- you’ll have to do it for EACH toolbar buttons
- the text+icon aspect is horrible and buggy (if the list is longer than your screen, you won’t be able to scroll down and you’ll simply miss tools).
- There’s a video somewhere of McNeel talking about the new interface and showing how to do that.
My advice is in general: learn to live the new interface. McNeel doesn’t want to put efforts (aka money) on the UI, unfortunately.
The UI on Mac is a nightmare.
Since you are on a Mac, how do you feel the model navigation with Rendered mode is, in Rhino8 compared to Rhino7? If ever, we’re looking for feedbacks from Mac users here.