Sometimes you have a day selected on click on "Row evolution". Then you maybe notice you introduced a new feature only 2 days before the start of the current shown row evolution. It would be very handy and useful if there was a button on the left and right to click on to extend the range shown in the row evolution. Maybe there could be even a date selector that lets me change only the shown row evolution but not the page itself in the background.
Otherwise one has to close the popover, then figure out what day to select to see actually the interesting part of the row evolution, then wait for a reload and click on the selected row evolution again. This is a lot of effort that can be very annoying when analyzing data in Piwik. Afterwards you have analyzed the row evolution, you have to close the popover again, and select the day you were viewing before and wait for a new page reload again. This is all quite a bit of an effort.