Using Logos 4.5 Beta 14 on Mac, appears keyboard shortcut Command-= in Notes increases Font Scaling while Command-- decreases Font Scaling, which is appreciated.
However, Shift-Command-+ also increases Font Scaling vis applying Superscript (as documented in Help). Likewise, Help has Command-= for Subscript in Rich Text Editor; Shift-Command-_ would be complementary to Shift-Command-+ and peacefully coexist with Font Scaling shortcuts.
Keep Smiling [:)]