From a post in French: Application "boite à outils" curieuse - #2 by Anonyme
Hello,
this application is simply from your SIM card. Indeed you can’t delete it, and I don’t think it’s possible to hide it either (at least not on Bliss Launcher). If you remove your SIM card, this application will disappear from the home screen.
On FP you can remove the sim card, do a reboot of the phone and put the sim card back. Normally the SIM Toolkit icon should be gone.
Other solution not tested from this post: BlissLauncher randomly rearranges ALL my apps alphabetically - #30 by aibd
Then Settings > Apps and notifications > Show all apps > Bliss > Storage > Clear storage.
This will put all your app icons to “standard position” I suggest you leave them there
Maybe that will solve the problem.