Search bar, help mode and notifications
The search bar, the help mode, and the notifications are located in the upper right corner:

"Search", "Help mode" and "Notifications" buttons
Use the search bar to the left of the user menu to search documents by keyword(s).

Search bar (for searching the entire application)
If you enter multiple words (without quotation marks), the spaces will be interpreted as "and/or".
The help mode provides explanations of various DocuMine features. You can find it at the top right (next to the search bar), and in various dialogs.

"Help Mode" button
Notifications inform you about current events that are relevant to you. The Notifications button in the top right is highlighted in red if you have unread notifications.

"Notifications" button
Click Notifications to list your notifications.

Notifications
You can manage your notifications in your user account. It includes a list of all the events you can be notified about.