When playing a video in XnView using the internal player,
if you choose Zoom In or Zoom Out a black strip will appear to the right about the thickness of a scrollbar.
XnView 1.80 <x>
AMD Ryzen 3 3300X 3.8Ghz, 16Gb DDR4, RX6600XT with Dell U2520D at 2560x1440@60Hz
PhotoFiltre 11, Vivaldi Browser 6.0, Windows 11 Pro x64 22H2 + Snipping Tool and XYplorer
XnView Tweak UI - Tool to customize your XnView beyond the regular XnView options. UI-less Settings - Documentation of all the hidden settings in XnView. XFAM - Tool to create and customize XnView file associations.