Here is a small guide if you need to filter values via the App. Filters allow you to pull up specific items to investigate readings, examples include the cell temperature of the battery, inverter power & grid usage.
On your home screen, you can click in the yellow box area, or down at the bottom on the 'Device' tab.
You then need to select your Inverter.
Then press on the 'Analysis' section at the bottom of the page.
Now you have this graph, with the defaults shown, you need to press the small filter icon seen here.
[Bonus Tip: if you want to see the graph in 'Full Screen' like the final picture at the bottom of this post, then press the 'Box' to the right of the filter choice shown in the picture below]
Now you can select at least two filter choices to view. (I think it depends on the grouping, as sometimes you are limited to only two items.) Once you have two (or more) you can press the 'Done' button to show the graph.
Here is the finished graph, note that you can still change the filter choices from the yellow box if you need. Also, highlighted in the Red Box, you can change the date to suit here, if you wish to view historic data.