From the main screen of the History tab, by pressing on a given month in the Months view, we display the list of activity entries only for the selected month.

Again, if we tap on one of the cells in the activity entry table, the entry editing screen is shown. Here we can modify the data of the same that we consider appropriate, or eliminate the selected activity entry.

If we find that the list is still very large, we can use the selector at the top of the tab to group the activity entries of that month by days.