You might need this mod:
Scrap Upgrade UI Framework
https://psteamcommunity.yuanyoumao.com/workshop/filedetails/?id=3384239916

i don't see the UI element to upgrade the units am i missing something?

forget it, I already tried it, yes it works, thanks a lot

that mod is for DE, does it still work for this submod??

Ok, I went through my mods and this mod adds a slider for the marks list:

Dark Elf unit upgrades
https://psteamcommunity.yuanyoumao.com/workshop/filedetails/?id=3038624346

Sorry that requires scripting which is outside my skillset.

Is there a possibility that you can incorporate the scrollbar in this submod?
Maybe this mod will help you: https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3244295546
PS: I already tried with these two mods activated and there is still no scrollbar :C

Yeah I run with about 220 other mods and I don't have this issue with this mod but if just use this mod and the required mods there is no scroll bar .

ah i see. all the other factions work just fine. i just thought it was odd.

Yeah this doesn't happen when I test with other mods so there must be a mod that fixes this but I don't know which one that is.

i noticed the scrollbar is missing when playing nagash so some of the buffs aren't available

A mod with that name has to be good <3

If you see any missed units call them out here please.