Hi Marcin,
I don't know of a way to open the recently viewed items drop-down list that you show in your screenshot by using a keyboard shortcut, but I'll check with the development team and post back here if there is a way.
You can navigate among the open panes in the application, such as the workspace, project tree, and resources pane (which has the Servers list, Task list, etc), by pressing F6 and Shift + F6.
A complete list of keyboard shortcuts for SAS Enterprise Guide is available in the online help - in the table of contents, expand the About SAS Enterprise Guide section and click Keyboard Shortcuts.
thanks,
Jennifer
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