This Openplanet plugin does the trick of turning "Always display records" off and on again to refresh the leaderboards at the click of a button, saving you a few clicks to the settings. It is also styled to fit in with the default UI, hides in gamemodes where the leaderboards aren't visible, and hides when the leaderboard has been collapsed.
Is the leaderboard visible, but the button not? Or did you encounter any bugs or problems? Please report them in the Github repository by creating an issue. You may also post suggestions or feedback there. Github repo: nbeerten/tm-refresh-leaderboard