I can’t stand the new Photos app – I just want a grid back! Here’s how to get it back to the way it was.
In the Photos app, click on “All Photos” in the lower right.
Once you’re there – and it should look a bit closer to the old app now – click on the +/- in the top right hand side.
Hit – to increase the number of photos on your screen at once, and + to decrease it.
By doing this you can put it back pretty close to how it was – much more useful for rapidly skimming through photos, in my opinion. The new update may have made it prettier but it made it less useful in the process for those who need to skim back through hundreds or thousands of photos to find one specific shot.