Show total in investment category

In the categories, reports, etc. tab, the total amount spent on "investments" should be the sum of all transactions.

For example, if in one month I invested $500 (debited from the account) and withdrew $200 (received in the account), the category total should show $300, not $500.

There should also be a way to filter and remove entire categories from the report. For example, I don't consider investments to be expenses, so it doesn't make sense for them to be included in the final report.