Improve multiple selection for Security Dashboard dropdowns

Problem to solve

When selecting multiple entries in the Security Dashboard filter dropdowns, the list is closed every time you click on a new item. This creates a weird behavior that may lead to confusion and incorrect selections.

Example:
I want to see critical vulnerabilities: I open the severity dropdown and click on Critical. Then I want to see low vulnerabilities: I open the dropdown and click on Low. The dropdown will close, but both Critical and Low will be selected. Even if I know that, I have to continuously open and close the dropdown to select/unselect multiple values.

Proposal

Keep the dropdown open when you select a value, and apply the full list when clicking out of the list.