There are several older feature requests asking for this. The only one I found that has votes is this one:
Stretcheable Advanced History and Presets palettes - DxO PhotoLab / Feature requests - DxO Forum
The oldest one I could find is here, despite the claim in it that there are even older ones:
Please look for existing feature requests you can vote for and add comments to before starting new ones. I already voted for the 2020 request (“Stretcheable Advanced History and Presets palettes”) (sic) long ago and won’t be duplicating my efforts as new requests for the same thing get created. Adding comments to old threads will bump them to the top of the recent-post list so that other users can see the request again.