Select Face Loop
The Select Face Loop selects a face loop from each selected face.
ProBuilder only considers faces part of a loop if they are quads (contain exactly four sides). Face loops generally run along the Z-axis, while face rings generally run along the X-axis.
This tool is only available in face mode.
Tip: You can also use this tool with the Opt/Alt+Shift+L+Double-Click hotkey, or from the ProBuilder menu (Tools > ProBuilder > Selection > Select Loop).