You can crop one to 7" x 5" and then copy and paste that development setting over the rest. I think it crops from the original setting though so you have no control over what bit gets cropped.
Crop image, back to grid view. Right click image, Developer Settings / Copy Settings. Select the crop options. Select other photos, right click Developer Settings / Paste.

Easiest way.
Get first image and crop 7x5.
Then use shift + lh mouse button (or ctrl depending on what you want to select) to select all the images you want to crop.
In the library module bottom right is a button - sync. Click on this.
Up comes a pop up asking what settings you want to sync. Deselect all then select 'crop'.
Click OK.
Robert's your mother's brother. As they say![]()