eBay doesn't have a 4 labels per page setting.
It's possible you're running into the label formatting issue that's been plaguing sellers the past week where their normally horizontal labels are instead printing vertically. If that's what you're referring to then:
Until eBay fixes the problem I suggest using the bulk flow. Single labels can be purchased through the bulk label flow. Just open up bulk shipping, check all except the one you want to buy a label for and delete the rest. That's how you can do it one-at-a-time in bulk.
If that is not your issue, then see below for changing label size. You have to do it within the label flow.
On the label purchase page first make sure your label options are expanded (text is slightly different from below screenshot - it now says 'switch to advanced shipping'):
When your shipping options are expanded:
If you're using bulk labels:
If you're using the app:
