A filter can be applied in the Navigation pane tree view by typing characters in the search/filter box. This filter is then applied using the specified settings in the application File – Settings – User interface – Filter.
Select the ellipsis button to display the filter options.

The filter expression is matched against fields as selected in the filter options such as:
Search multiple or all vaults at once.
Field options (folder, host, username, etc.).
Asset information (name, email, phone number, serial number, manufacturer, domain, IP address, etc.).
The Navigation options limit the search parameters to specific entry types such as sessions, data entries, etc.

The Search options offers the chance to customize your search, such as including shortcuts or favorites, making it case sensitive, and more.

Use the keyboard shortcut Ctrl+F to quickly have access to the Search/Filter control. This can be disabled in File – Settings – User interface – Keyboard..
You can set the focus back on the Navigation pane by using the keyboard shortcut Ctrl+L, this also can be disabled in the options.
Here a few implementation notes for the Boolean filter:
Remote Desktop Manager use the C# nomenclature (&& for AND, || for OR).
Evaluated left-to-right.
No parentheses matching.
Double-quotes (") are not required or removed, they are part of the text filter, do not use them unless you are looking for a double-quote.
Leading/trailing white-spaces are trimmed.
Correct uses of Boolean filters:
Boise && Laptop
Boise&&Laptop
Baton Rouge || Boise && Laptop
Laptop && Baton Rouge
Incorrect uses of Boolean filters:
Laptop && "Baton Rouge", which filters for the string "Baton Rouge" and not the string Baton Rouge.
Laptop && (Baton Rouge || Boise), which filters for Laptop, and the string (Baton Rouge || Boise).
A filter can be applied in the Navigation pane tree view by typing characters in the search/filter box. This feature is accessible from the Remote Desktop Manager macOS quick access toolbar.
Click on the magnifying glass icon in the search/filter box to display search options.

The filter expression is matched against fields as selected in the filter options such as:
Group
Type
Host
Username
Domain
Description
Keywords/Tags
Contact information
It is possible to exclude results by choosing to display entries that match certain criteria:
Session types (credentials, script tools, VPNs, etc.)
Sessions marked as Favorites
A search by types can be executed to include sessions, data entries, contacts, documents, credentials entries, VPNs, Macros/Scripts/Tools, etc.

The Search options menu offers the chance to customize your search by applying the filter to subentries, making it case sensitive, and more.
