The mod in question is "The One Probe". Since you already have HWYLA (older name WAILA) installed, it probably is not necessary. The difference between the two is that TOP can be configured to only show when you have the Probe item in hand, while, iirc, HWYLA is always active and has no such item .
Idk about HWYLA, but the TOP window position can also be configured in the "Mods" menu. The other good thing about TOP is that it is possible to configure it to show item amount in chests etc in the same information window. If you do not want to remove the mod for some reason, take a look at the "Mods" menu, look for "The One Probe" or look for "theoneprobe.cfg" in your config folder.