Improve discoverability of hide/show instrument in Timeline
The timeline has a very useful feature that allows the user to hide or show individual instruments by clicking on the right hand end of the instrument label. If the user hovers the mouse pointer over the correct area an open/closed eye icon appears that indicates the visibility status of the instrument. It is not obvious to the user that this facility is there other than by reading the handbook (https://musescore.org/en/handbook/timeline#Hiding_instruments) or through coming upon it by chance.
My suggestion is to make the eye icon visible at all times without requiring a hover or to replace the icon with a tick box. (The eye icon is cute though.)