To edit the desired layout frame, select it by clicking on it - or select several frames by dragging a selection rectangle over the page(s) while holding down the mouse button. As soon as you have selected one or more layout frames, they are marked with a colored border (= border frame). Now you can edit the frames as follows:
Rotate photos:
Inside the layout frame, there is a round dot at the top center. Simply drag it to the right or left while holding down the mouse button - your frame will then rotate in 1° steps. A 90° rotation is possible via the context menu (right mouse click) > "Rotate objects left/right".
Move/reposition photos:
To move photos, move your mouse pointer over the border frame until it becomes a cross with arrowheads. Now you can reposition the desired frame by holding down the left mouse button.
Delete photos:
To permanently delete an image from your Pixum Photo Book, simply press the Delete key or right-click > "Delete" with the frame selected. To remove the corresponding layout frame, for example to redesign the entire page or leave it blank, simply repeat the process a second time.