How do I have Writer open with a blank doc as default?

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Hello,

Using Open will default to opening an existing document with your default directory chosen. Instead, from the menu choose File->New->Text Document.

Additionally in my Mint system there is a item for Writer with command of libreoffice6.1 --writer %U which opens a 'blank' document.

It depends upon OS.

On Windows, there are separate launcher executables for each respective component, like swriter.exe, which do just what you want (in a nutshell, it runs soffice.exe --writer for you, which creates a new Writer document); and the executables allow you to simply create shortcuts for them. Also, you may create such a shortcut yourself, with the cited command-line argument.

On Linux, I believe, there's no binaries for the task, so it might be shell scripts that run such a command line, which means that one could pin the launched app to a taskbar, but actually have plain soffice/libreoffice command pinned. One would need to find (or create) the shell script or other kind of shortcut with required command line, and pin it, instead of generic one.

Go once to the File>New>Text document menu. In the sidebar, customize the Style / Paragraph Style template to your liking or create a new "Paragraph Style". Also check the "Page Template". If all settings meet your needs, select File>Document Templates>Save As Template... from the menu. In the "Save as template" dialog box, select a name. And put a checkmark under "Save as default template" and save. The next time you call Writer, your saved template should open.