“SIMBLAgent.app“ wants access to control I updated to Mojave yesterday and since then I get so many windows prompting up with the message “SIMBLAgent.app“ wants access to control... and I can get rid of all those windows comming. 

Someone knows how to stop that?, any help is appreciated
These messages are part of the new security measures in Mojave. You are giving up control of your system to apps you may not intend, so you should deny those requests until you’re sure it is not malware or something you don’t want typing / interacting on your behalf. 

Consider, an app could copy text like passwords or just watch for you typing / save screen captures using these permissions. Not all do, but you might use caution before disabling security. 

You can try giving the app full disk access in the System Preferences.app > Security &amp; Privacy > Privacy > Full Disk Access. Add the application by using the [+] icon or by dragging to the list.