To move the group window, you can click and drag the title bar of the window to any position you want. You can also resize the window by dragging the bottom right corner. This way, you can avoid blocking the monsters or other elements on the screen.
To prevent accidentally joining a group when you tap the close X button, you can disable the feature in the settings menu. To access the settings menu, click on the gear icon in the bottom right corner of the screen. Then, uncheck the box that says “I am looking for a group”. This will make it so that you have to manually search for any group invitations.
Otherwise I have no fucking idea what you're asking.