Back office pages (which are views) are used to load iFrames or to create manuals for example. A page can be added as a form’s subview. Previously you could only adjust the widths of data grids or forms as subviews. Now you can also adjust the width of a page as a subview. Insert the right pixel amount to preview pages to your wishes.
How to adjust the panel width of a page? Create a page as a form’s subview. Click on it. Go to builder mode (or press ‘e’ on your keyboard) and click on the gear icon at the top left. The edit page modal appears. Adjust the width amount, and press save.