When accessing a Pi remotely via RealVNC , the viewer often defaults to a window size that accounts for taskbars and window borders on the host machine, resulting in this specific cropped dimension.

While most users are familiar with standard resolutions like (Full HD), the 1191x670 resolution typically arises from:

jpg (2.6M) Patagonian Sunrise. jpg (1.7M) Perched Lighthouse. jpg (2.2M) Tree Over Grand Canyon. jpg (2.1M) Wind-blasted Mountain. Customise your Raspberry Pi desktop

Under the "Appearance" tab, you can browse for your 1191x670 image.