You may find it easier to view the EGM in ‘mosaic’ format. Here, each study is one square, which makes them easier to count by eye.
At the top left, click on ‘filters’. Then two columns come up: on the right column, click on ‘mosaic’. Then click on ‘update’.

This is what mosaic mode looks like:

7) Finding all studies about a particular type of intervention
9) To find studies from a particular geographic region or country