How do I zoom in using hotkeys?

[AnnanFay]

In the search results or file browser how can I change the thumbnail scaling using hotkeys? (I'm not talking about zooming a single image when open or in the preview pane)

[Ctrl] + [+] doesn't work, nor does [Ctrl] + [Mousewheel].

The only way I have found to change the zoom level is to use the slider at the top right side of the screen. There must be a better way than this?

[xnview]

the only way is to use menu or settings