Hello @zwanets,
Hope you are doing great today.
You can use the below add-on in order to set the new link template on all of the documents at a time.
WPDM Default Values
Alternatively, Based on the above-mentioned scenario you can edit the default link-template as well by following this so that it applies to all default link templates.
However, for the PRO version, you can edit a template easily by following this.
Let us know if you need further assistance regarding this matter.
Thank you