Are you looking at the widget on the overview page (1) or on the dedicated page for the changes (2)?
-
Since 5.4.0.1 it shows only Non MainWP changes from today. I’ve already asked to remove the today filter in V5.4 - Sites Changes loads many records - #6 by josklever
You can change the filter for Non MainWP and/or Dashboard changes via the 3 dots on the top right of the widget. -
There are filters on top of the page, so maybe you have filters applied that have no results. In my case the filters are not the most practical either and I already noticed that I had to apply them again to show the most recent data, but I have to test that some more as well.