You probably clicked on the "Toggle 2D/3D" option in the Local Menu while the Select tool was active. Select the "Selectorâ€¦Properties" option on the Local Menu and go to the General page. Choose "2D/3D Dependingâ€¦".
The selector can differentiate between 2D and 3D objects. A selection of 2D objects will show a 2D selector box (a single rotation bar and a short Inspector Bar. A selection of 3D objects will show a 3D selector box (X,Y and Z rotation bars and a longer Inspector Bar. If 2D and 3D objects are selected together, they will appear as 3D. Moving 2D and 3D together can affect the workplane of the 2D objects. When first starting out with TurboCAD, it's usually best to use this setting, as it creates the least amount of problems; i.e. shifting workplane.
Designer, Deluxe, (Professional, Expert, Basic), Platinum
Windows 10 Pro (1803), 64-bit