Leusing

Please add the function to permanently reset the "cycle selection box", not only temporarily. Thank you.

Apps: All
Platforms: macOS, Windows and iPad
Previously when you cycled your selection box this was only a temporary operation. You can now make this permanent...
From the select menu there are two options:
- Cycle selection box (this was the existing option)
- Set selection box (the new option)

Also note the shortcut for these - [Full Stop] to cycle and [CMD + Full Stop] to set on macOS and iPad or [Ctrl + Full Stop] to set on Windows.
The new feature is that after cycling to the selection box you want you can now permanently set that for your current selection by using the Set Selection Box command.
In the example below, I have two shapes which are rotated by the same amount. Therefore when they are selected by default the selection box is oriented to match the shape's rotation. Now if I want to permanently make those shapes have a selection box which is oriented to my page I can cycle to regular bounds and then Set Selection Box, which will now make that persist every time I select those items in future.

 
A couple of other notes on this feature:
As well as cycling to the base box and regular bounds of an object, if you have a grid set which has a different rotation to your page (or, are working on an isometric plane for example) you will additionally get the option to cycle and set the selection box to be aligned with the the current planar bounds of the selection. If you have a multiple selection which includes objects rotated by different amounts, if you wish to set your selection box for all objects in your selection to match the orientation of one of them you can set the one you want to match to be your key object. Then when you cycle your selection box the "base box" option will match that object's rotation.  
 

Here, the same annoying problems with incorrect alignment due to a rotated cycle selection box that uses more empty space than necessary. Please add a feature to permanently reset the "cycle selection box", not only temporary with the "." shortcut. +1

Thank you.

The cycle selection idea works great, but it is not permanent. The bounding box returns to normal after you click off the object.
I often need to center images that are made of smaller images (some rotated). The bounding box for the group is not tight enough around the image to center it correctly. The Geometry Add idea doesn't work for me, either. Exporting to a PDF and then opening it was a perfect solution for my projects. Thank you, Bunfil.

I've said this before in other threads, but it is pertinent to this thread, too. so...
Every serious vector-based illustration program should provide for transforming selections disproportionally in any direction needed, not just horizontally and vertically.
So first, it is a very good thing that Affinity bounding boxes 'remember' their contents' rotation. Since Affinity does not provide transform tools, but only provides transform handles on bounding boxes, that is the only way to perform on-page scaling in directions other than vertical and horizontal. Yes, I agree that one should be able to permanently re-set an object's to page-normal when desired, but a rotated bounding box is a very useful thing.
Inkscape, for one example, insists on all bounding boxes always being page-normal. So when you need to scale a rotated  selection in the direction of its rotated orientation, you have to 'un-rotate' it so that the desired direction of scaling is either horizontal or vertical, perform the scaling, and then re-rotate it to its intended orientation. That's needlessly tedious.
But Affinity's treatment is still senselessly limited. Consider an object that is rotated 35 degrees. Its rotated bounding box is 'remembered'. So you can disproportionately scale it in either the 35 degree or 125 degree directions. But by what logic is it assumed that the illustrator does not need to scale the rotated object in some other direction that is pertinent and meaningful to the illustration.
Affinity bounding boxes provide an absurdly redundant FIVE rotation handles! One of them already has a different visual treatment: the 'lollypop' handle. Give that handle a practical and useful difference: Enable it to rotate the bounding box around the selection when a modifier key is pressed, thereby enabling the illustrator to 'aim' the transform handles in whatever direction needed, relative to the selection.
JET