Ug boolean operation cannot select entities.

Hello, are you asking why ug Boolean operation can't select entities? Ug Boolean operation cannot select entities for the following reasons:

1. Incorrect selection method: Make sure to use the correct selection method. In UG, the common methods for selecting entities are clicking, window selection and cross-window selection.

2. The entity is invisible or hidden: check whether the entity is hidden or invisible. You can ensure that the desired entity is visible by selecting View in the menu bar and then selecting Visibility.

3. The layer to which the entity belongs is locked: if the layer to which the selected entity belongs is locked, it cannot be operated.

4. Error in entity selection: The selection may not be successful due to operation error.