XS_BOLT_MARK_IS_ALWAYS_VISIBLE
Category in Advanced options dialog: Marking - bolts
Set this advanced option to TRUE to show the bolt marks of bolts hidden from views by other objects. The bolt marks are displayed with solid leader lines and frames. If you set it to FALSE (default), the bolt marks of hidden bolts are displayed with dashed leader lines and frames. This advanced option affects all drawing types.
FALSE:

TRUE:

This advanced option is model specific and the setting is saved in the options database.