Preference => Editor => Continuous Drawing
What is Continuous Drawing?
The Continuous Drawing setting drop-down menu options are "On" and "Off" Beam Studio sets “Off” by default.
While the Continuous Drawing set is “Off,” the cursor will switch back to the Select cursor after finish a polygon(Rectangle, Oval, etc...) drawing.
If the Continuous Drawing is set to “On,” the cursor will not switch back to the Select cursor.