ah lol i already created an option for this
look you need to have that setting like this and then it should work:
Screenshot 2022-09-17 at 10.01.05.png
this will sort the project index by tags alphanumerically from the get go
but sorting the tags in the filter tab will only have an effect of the order of tags in the tags part of the rows of the project if there are multiple tags listed for one project