Issue Summary

When opening the "Invite Customers" or "Add Customers" modal window in a Jira Service Management space, the modal lacks a vertical scrollbar. When operating on displays with 150% OS display scaling (common on high-DPI laptop displays and HD/4K monitors), the modal extends beyond the viewport, cutting off the bottom portion and preventing users from seeing or clicking the action buttons (e.g., "Confirm" / "Send Invitation").

Steps to Reproduce

1. Set the OS resolution/display scaling to 150% (or adjust browser zoom accordingly).
2. Navigate to a JSM space/project.
3. Open the Customers tab from within the Service project 
4. Observe the height of the modal and attempt to scroll down to reach the submit/confirm buttons.

Expected Results

The modal should dynamically adjust its height or provide an internal vertical scrollbar  so all contents and action buttons remain accessible regardless of display scaling or zoom levels.

Actual Results

The modal gets cut in half at the bottom of the viewport with no scrollbar available, making it impossible to confirm or send invitations without changing browser zoom.

Workaround

• Temporarily decrease the browser zoom (e.g., to 50%–75% using Ctrl + {} or Cmd + {{}}) to reveal the bottom action buttons.
• Hover somewhere else outside the pop up which then loads the options again.