Do 4:3 sources get stretched to a 16:9 format?

The product information does not specify whether 4:3 sources get stretched to a 16:9 format.

Questions & Answers: BUCIER 4k@60hz HDMI Multi-Viewer Switch with PIP, HDMi Multi-Switcher 4 in 1 Out for Seamless Switch, 4x1 HDMI Multiviewer Supports 8 Viewing Modes, 4k x 2k, 1080P, for Xbox, PS4/5

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BUCIER 4k@60hz HDMI Multi-Viewer Switch with PIP, HDMi Multi-Switcher 4 in 1 Out for Seamless Switch, 4x1 HDMI Multiviewer Supports 8 Viewing Modes, 4k x 2k, 1080P, for Xbox, PS4/5

Flexible Viewing Options: The 4K@60hz HDMI multiviewer has 8 versatile viewing modes to display multiple signals on a single display, including: Full Screen, Dual Side-by-Side, Dual Top and Bottom, PIP, 4 Equal Screens, and 1 Large and 3 Small Modes, providing flexible options for life and work.
Seamless Switching: The 4-in-1 HDMI multiviewer enables smooth and uninterrupted switching between four HDMI input sources in full-screen mode, functioning both as a traditional HDMI switch and a multiviewer. This dual capability ensures a streamlined and enjoyable viewing experience.
Universal Compatibility: The HDMI quad multiviewer supports a broad range of HDMI-enabled devices, including security cameras, Xbox consoles, Blu-ray players, HDTVs, projectors, monitors, and more. With true plug-and-play functionality and user-friendly operation, it offers versatile application across both professional and everyday scenarios.

$189^.99 –