Is it possible to resize the right click colour wheel? It's way too tiny for me, so I use separate colour selector, but maybe there is some option or trick to enlarge this one as well?

There currently aren't any options to resize the right-click pop up palette. What type of computer setup do you have (for reference). It would be nice to see what problem you are experiencing. a screenshot would be helpful.

I won't say it's really such a big problem, as it just comes down to my personal preference - I prefer to have a big color selector so I use a shortcut (shift+i) to open a popup color selector and I set it's size in preferences to 420px (preferences > color selector settings> behavior > zoom selector size). I asked, because If I could scale up the right click colour selector, I would be able to only use that one, since I have to use it anyway because it's the only option to change presets in canvas only mode. I don't think it's a setup thing - I use 22inch monitor + large wacom.