I was working on two different layers which I ultimately combined together using the "union" tool. However, I now have twice the information in the attribute table as shown in the picture. Any insight on how I can quickly delete the repeated rows?
As each row represents a feature, it looks like you have duplicated some of your features. If these features have identical geometry (ie you didn't edit the geometry in one file and not the other - and that explains why you appear to have half the number of features in the map as they sit directly one on top of the other), you can go:
MMQGIS->Modify->Delete Duplicate Geometries
You may need to install the MMQGIS plugin via
Plugins->Manage and install plugins...
You can also type 'duplicate' into the Prcoessing toolbox search bar and you will find another couple of tools that do the same thing.
Another option (a bit rudimentary maybe, but very simple) could be to create a new field, let's name it "num" for example, Just put $rownum as the expression. Then, go to Select by expression and type: "num" % 2 = 1 It will select the uneven rows. Then, click edit, and delete selected objects. In your case as I see the repetition is alwas the same (each feature repeated once) this should work.