Selections slash menus and dialogs - AaronDavidNewman/Smoosic GitHub Wiki
The buttons on the left (for L-to-R languages) bring up menus and dialogs. These dialogs can also be accessed via the 'Slash' keyboard sequences.
For instance, slurs, ties, hairpins and other modifiers that work on a range of music are created from the 'Lines' menu. You can access this via the slash menu:
/ l (el, not one) 2
Then you can use the modifier selection to edit the phrase marking to your taste.
You can also select modifiers or any menu option with the mouse.