Disable sync for a track

I just got an in reach mini 2 for tracker purpose etc. On route, for navigation I use a gpsmap. For this reason, I don't want my tracks etc synced from web explorer to the inreach mini. On route, I'll enable 'starrt tracking' on the mini.

Now, in the explorer I uploaded a gpx made in plot a route. This shows on the map. I placed it in a collection for a specific date (I've two collections for two days). This way it's easy to see a route for a day for the home front (unfortunatly you can't add a 'show on date...' to the track). The collection isn't syned, I've set in reach mini to sync a specific collection 'received from gps'.

What is left, is to disable those 'triangles'  on the track. If I'm correct you change the sync setting of the track via that two arrow button in web explorer. If you set it to disabled you'ld get dots. However this doesn't work. It keeps coming with the message 'you must perform a sync for your devices....'

someone know how to remove those triangles?