If you use VBA Tools dialog boxes as user forms, they will be shown with the default modal.
This means that the focus will be set on these dialog boxes and no entries from MicroStation can be made as long as these dialog boxes are opened.
In turn, such a UserForm does not need to remain open after the functions are no longer required.

To hide a modal UserForm, the following can be passed as a parameter when opening the module:

UserForm1.show vbModeless

You can also set this property directly in the user form by changing the property "ShowModal" to false, as shown below:

With this setting, a UserForm can be opened and remain open while you perform other MicroStation commands.