How to align along a 45º line to reduce cuts?

I think this is what @Bonjour was trying to show:

With the object selected, move the cursor to a corner of that object and notice the change in pointer style. This indicates you are now over a snapping point as described in the documentation here: https://lightburnsoftware.github.io/NewDocs/TipsAndTricks.html#snapping-behaviors

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Click and drag toward the desired corner for placement and snap to that corner, then release.

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A view once placed and zoom all the way in.

Is this not working the same for you?