You can see all changes via the Changes Drawer

In Dev Tools, you can locate the Changes Drawer via either:
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A) Open Command Palette (Ctrl + Shift + P) and type “changes“

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B) Open Drawer (Esc), click on the more options menu (triple dot), and select Changes

Further Reading
- How to get a summary of your CSS changes in Chrome dev tools?
- Export CSS changes from inspector (webkit, firebug, etc)
Updates
- Dev Tools 98 added More precise changes to automatically pretty prints changes
- Issue #1296143 opened User-Select: none in Changes drawer makes it very hard to utilize