One of the new features I will introduce in Keepmark 1.14.0 will be a sidebar in the context of an open document. The first item on this bar will be the Similar Documents list, from which you will be able to call the preview of the selected document in a new window.
In fact, I introduced a mechanism of similar documents a few months ago, but there was no place to present this list. This feature was mainly created to suggest a list of tags that can be added to a document (10 the most similar documents were searched for and then their most common tags were taken as suggestion).
Besides the list of similar documents on this sitebar, I also wanted to place document relations with other documents or with other people (introduced in the previous version of Keepmark).