open the Theme Tweaker and scroll down to the Media Items section.
select what you want to change and the color window will pop up.
select the color you want and click OK
This change will not be permanent until you save the theme in the main Theme Tweaker window.
If you don't save the theme, the changes will be lost if you re-load the theme, load another theme or close Reaper.
I find it helpful to write down the current color settings, as well as colors I'm changing to before saving.
I also make a backup of the theme before making changes, so it's easy to revert back, if needed.
Also open 'Options/Preferences/Apppearance/' and try changing the settings under these 2 areas:
Peaks/Waveforms
Track Control Panels
Changes made here are saved at the time and remain intact if you change themes or close Reaper.
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