LibreOffice uses the native file picker dialog of the window manager of your operating system for thecommand.
To save a document as a template, use the command File - Templates - Save As Template.
Enter a file name or a path for the file. You can also enter a URL
Select the file format for the document that you are saving. In the display area, only the documents with this file type are displayed. File types are described in Information on Import and Export Filters.
Always save your document in a LibreOffice file type before saving it to an external file type. When you export to an external file type, some formatting features may be lost.
Saves the file.
Save with password
Protects the file with a password that must be entered before a user can open the file.
Only documents using the LibreOffice XML-based format can be saved with a password.
Encrypt with GPG key
Use OpenPGP public keys to encrypt documents.
Edit filter settings
Allows you to set the spreadsheet saving options for some types of data files.
Exports only the selected graphic objects in LibreOffice Draw and Impress to another format. If this box is not checked, the entire document is exported.
If you are exporting to any document file type, the entire document is exported.