New ShowPageNumberInTabs setting (off by default) shows the current page as n/N after the file name on each tab.

Type = in the command palette to list advanced settings; press Enter or click to toggle a true/false one.

Open File Without History… (CmdOpenFileNoHistory, command palette) opens a document without adding it to File History or Windows Recent Documents (#6121).

With SidebarWindowSize = grow, showing the Bookmarks or Favorites sidebar enlarges the window, when there’s room, so the page keeps its size, and hiding the sidebar shrinks the window again. The default keep leaves the window size alone (#6080, #6205).

Clicking a file-attachment annotation that holds a PDF or another supported file type opens it in a new tab, straight from memory (discussion #4276).

In PDFs with page labels, such as roman-numbered front matter, the toolbar shows the labeled page count alongside the physical page count.

In the Bookmarks and Favorites trees, single-letter shortcuts run their commands instead of jumping to an entry. Arrows, Enter and Space still navigate.