The Rules Tools group in the Process tab has two different appearances, depending on whether Visio is in Developer Mode, or not.
In standard mode, the Rules Tools group only contains the Selection Issues button, besides the Help and About buttons.
Rules Tools group in standard mode
Visio can be switched into Developer Mode by ticking the option on the Advanced panel on the Visio Options dialog that can be opened from File / Options.
Advanced Visio Options
In developer mode, the Rules Tools group contains all of the extra buttons.
Rules Tools group in developer mode