Hey @Samathan,
I need a few more pieces of information. First, can you go into your player controller settings and check your mouse settings in class defaults and see if capture click events and show cursor are enabled by default?
Second, can you show the blueprint(s) you are using for creating your click and drag effect? Can you disable all widgets and try this again, to see if a widget is somehow eating your inputs?
Finally, if you are setting Game and UI input manually somewhere, can you confirm that the checkbox on the boolean for “Hide cursor during capture” is NOT checked?
I look forward to hearing from you!