The Pro Access Selector is a tool inside of Roland Cloud Manager that allows the activation of any two Legendary instruments in Pro Membership.
NOTE: The Ultimate membership doesn't have the Pro selector since you have access to all the instruments.
Toggling between Enabled and Disabled by filtering in your Library will reveal what instruments are currently active and inactive. Remember, only two Legendary instruments are available at any given time in Pro Membership.
Some items that are not available with your subscription are available to be selected. Only two instruments may be selected at a time.
Instruments eligible will have the Pro Selector next to the install button on the My Library page (Software Instruments > My Library):
To select an instrument, simply click the toggle.