So, first you need to open up the linked file and select that red thing so you know what it is (write it down so you don't forget). Next, go into visibility graphics (VG) or the view template if there is one applied, click the Revit Links tab all the way on the right, then click the By Host View button under Display Settings. Change the 3 circles to the custom one, then click on the relevant tab to the right (model or annotation categories), and change the drop down to also be custom. Now you can find whatever the type is and turn it off.
