Unknown flag -a after update, don't know how to edit flags

I updated and now I can’t launch syncthing. Where is the config file that hosts these launch flags?

Edit: solved myself. There is not file, it’s in the synctrazor menu, just hit the settings button about the log, click the syncthing tab and open advanced. I must have missed this advanced section because I’m remoting in from my phone using rustdesk.

Change single dash to double dash as per other sources of info, so - to –

You also want Synctrayzor v2