Toolbar¶
By default the toolbar has 
Open, 
Save,
Reset, 
Model, 
Tape Player,
Disk Manager, 
Fullscreen,
Virtual Keyboard, 
Gamepads, 
Debugger,
Options and 
Mute, and at the right end
Rewind, 
Slow Motion,
Pause, 
Fast Forward and
Fast Mode.
Right-click the toolbar to change it:
Buttons - every command that can be a button, by group; tick the ones you want.
Remove - removes the button you right-clicked.
Add Separator Here, Add Space Here - a line or a gap between groups.
Icon Size - Auto, the default: 24 x 24 while every button fits the window’s width, 16 x 16 when it does not. Or always 16 x 16 or 24 x 24.
Restore Default Buttons - back to the set above.
Lock Toolbar - on by default, so a slip of the mouse moves no button.
Hide Toolbar - View > Toolbar brings it back.
To move a button, untick Lock Toolbar and drag the button.
The arrow beside Mute opens a volume slider. Alt with the mouse wheel over the picture changes the volume too.