You can customize many of MuseScore's default behaviors via the menu: Edit→Preferences... (Mac: MuseScore→Preferences...).
The Preferences dialog has multiple tabs:
Reset All Preferences to Default will reset all preferences to the ones MuseScore had when you installed it. Ok will save the settings and close the dialog. Cancel will close the dialog without applying changes. Apply will make changes take effect without closing the dialog.
Here you can define:
Use Canvas to set your preferred color and wallpaper for the score background and paper. The default "Background" is grey (RGB 221, 221, 221; Alpha 221) and the default "Paper," white.
On this tab there are note input and MIDI remote control preferences. Here the following can be set:
Midi Remote Control allows you to use certain keys on your MIDI keyboard to enter notes and rests and to select note durations, without involving the computer mouse or (computer) keyboard. The default setting is off.
To assign a command to a MIDI key:
Once you have defined your key settings you can use the MIDI keyboard to control note input operations. You can verify your key settings by observing the MuseScore Note Input toolbar while pressing the MIDI keys.
To temporarily deactivate Midi Remote Control: uncheck "Midi Remote Control": all MIDI input key action buttons are now greyed out. Note: Your key assignments are always saved between MuseScore sessions and are not affected by deactivation.
Notes: (1) The "Clear" option turns off all the green buttons for the current MuseScore session but all the user-recorded MIDI key settings are retained and will be reloaded on the next session. (2) A MIDI key setting that is activated cannot afterwards be turned off, and the green button will always remain lit: however it can be overwritten with a different MIDI key by using the red button again. (3) If the same MIDI key is accidentally assigned to more than one option, then all the associated green buttons remain lit although only one will work. To fix, see "(2)".
Score preferences include
This enables you to set the audio interface (API) and specify the device to be used for audio playback: e.g. built-in speakers/headphones, USB headset, wireless, etc.
When an external MIDI input device is connected, its identifier appears in MIDI Input. When the device is connected for the first time, you also need to select the correct MIDI Output option in order to enable note input and correct audio playback (e.g. in Windows, this might be "MMS<device name>"): then close and reopen the program to confirm the changes.
Check these options as required if using the JACK Audio Connection Kit.
These settings determine how files from other sources are imported:
These settings determine how various files are exported from MuseScore:
Every action possible with MuseScore is listed, with the associated shortcut if it exists. To define a new shortcut, select an existing entry in the list and click Define... (or just double click the entry), then enter the new shortcut using up to four keys. You can also reset any shortcut in the list to its default value, or clear a shortcut you select. Shortcuts listed in preferences appear next to their associated commands in the menus.
Note: Some shortcuts, including default ones, may not work with some keyboards.
You may Save the list of shortcuts to a file of your own choice, and Load it later, making it easy to work with different shortcut settings for different purposes.
The list of shortcuts can be printed out or exported to other media (pdf etc.) using the Print button in the bottom right of the window.
This sets whether MuseScore will check for updates and extensions at startup.
Updates may be checked manually in Help→Check for updates.
Allows you to control specific settings for "application, "export", "i/o" and "user interface", as well as color settings for the Piano Roll Editor.