Object Width +1 Pixel  ⌥⇧→

Change the size of the selected object — make it one pixel wider.

In the days of retina displays and massive numbers of pixels it remains unclear about how useful this is. A 19 inch screen that is 1024×768 pixels has a pixel count of approximately 100 per inch. My Retina 5K iMac (5120×2880) is closer to 320 pixels per inch. My eyesight can’t distinguish a single pixel difference in dimension anymore.

Adjust position, size of objects in the Logic Pro Environment — Apple Support

Objects can be freely placed, which allows for flexibility, but can lead to overlaps or misalignments—particularly when pasting between layers. Fortunately, you can quickly clean up object positions.