Hi, I solve the problem:
I had wordpress installed and everything worked.
I recently decided to change the installation miltisites, again everything works fine.
I just have a problem with the URL. For categories I had set slug "styl", so that URL looks like:
After activation multisites is now URL (events/categories/...):
:-( I do not want this URL
Other slug working properly, the problem is only with the categories.
Can anyone advise me? Slug I still set to "styl"