The Line tool in PS version 22.3 is more a weird striping tool. Line Weight should be limited to something like 0 to 100 pixels. Photoshop versions prior to PS 2021 line weight was limited to 1 to 100. The Arrow head setting should be settings that are relative to the current line weight setting (Line Weight Times a multiplication factor) that the multiplication factor a positive value range from 1x to 5x IMO. When line weight is 0 there will be no arrow heads there will be no line fill there will be just a line path which the line tool can stroke like Adobe want the line tool to be able to do..