OS: Windows 10 v21H1 and Windows Server 2022
Upon right-clicking on one of the items in the "Folders" pane, a context menu appears. One of the items in this menu is "Search..." (fourth from bottom.) However, this item doesn't do anything. I expect this item to be the equivalent of Ctrl+F or the "Tools → Search..." item on the main menu.
Effect: Minor nuisance; we still can perform searches, just not with that item.
To reproduce:
1. Install a copy of XnViewMP 0.99.1 on a clean machine.
2. Start XnViewMP.
3. Accept the defaults for the first-run setup.
4. In the "Folders" pane to the left, right-click on a file system object, e.g., "Windows", "C:\", or "Program Files" (it doesn't matter.)
5. From the menu that appears, select "Search..."
Actual behavior (bug): Nothing happens!

Expected behavior: The "Search" dialog box must appear, as if you have pressed the CTRL+F key combination, or selected the "Tools → Search..." item on the main menu.