support Z-roof (mm) is set to 2, this means it will not try to print support for anything above 2mm off the platform. I have not found any way to get reliable bridging with Kisslicer. the best i've been able to do is print with at least .2mm layer height, turn the fan on full for "solid infill" (it helps to have a fan duct so the cooling air is pointed right at the piece being printed) and slow the print speed WAY down for solid infill. the minimum speed setting is found under the printer -> speed tab. i think slowing the acceleration down a lot would help with bridging also. the problem with all these settings, is they affect the whole part (making it print really slow), and not just bridges.