I enabled Early Bird to try the new Split Screen with up to four pages. Creating a split with 3 tabs works fine, but the window is always split into equal parts and I can't resize the panes.

Expected: As with the previous 2-tab Split Screen, I should be able to drag the divider between pages to make one pane wider or narrower.

Actual: No draggable divider. The cursor doesn't change to a resize cursor anywhere between the panes, so the widths are fixed.

Steps to reproduce:

1. Enable Early Bird (Settings → Early Bird) and restart.
2. Create a split screen with 3 tabs by dragging them into the window.
3. Try to drag the border between two pages.

OS: Windows [version]
Opera GX version: [opera://about]

Resizing is essential for my workflow (e.g. a wide document next to a narrow reference page). Could you add it to all layouts (vertical, horizontal, grid)?

Thanks!