Near the quarter of the Theme development/tweaker window list, you have the following :
media item background (odd tracks)
media item background (even tracks)
media item peaks (odd tracks)
media item peaks (even tracks)
For a mysterious reason, only the ones mentioned in bold are doing something.
And there is more : you can see right away the color change for the preview background but, to see the peak color change, you have to, either launch the play, or close the media explorer and open it again...
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DAW: Ryzen 3700X|Asus X-470Pro|32Gb|2 SSD512(M2)+1024|W10Pro(64)|RME Fireface UCX+ADA8200
Soft: Reaper|Cubase 10|Emulator X3 & several other VSTis (2 bridged)...
Gear: VMK-188+|MPD32|ME30P|Korg 05R/W|Roland D110|Yamaha TX802|Pre-MIDI stuff...
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