With Guitar Pro 7.5 you can choose to hide or display the tablature, standard or slash notation.
Go to the Track inspector located on the right of your window.
Select "TRACK" above this section.
Locate the "MUSICAL NOTATION" section.
Right to "Notation" you will notice 3 icons which represent the type of notation:
Tablature, Standard, Slash.
Select one of these icons to enable or disable the related notation in your score.
A blue icon means that the notation is activated.
You can enlarge the video below to see how to access these settings.