When following this quick start guide: https://doc-snapshots.qt.io/qtformcus-dev/qtul-qsg-traveot2g-designui.html

There are these instructions:

But when trying this, the property name, type and value keep the initial settings without changing: 

See the attached video for a demonstration.

Tested with the following version:

Qt Design Studio 4.5.0

Based on Qt 6.5.5 (MSVC 2019, x86_64)

Built on May 22 2024 04:25:01

Reproducible also on Linux:

Qt Design Studio 4.5.0

Based on Qt 6.5.5 (GCC 10.3.1 20210422 (Red Hat 10.3.1-1), x86_64)

Built on May 22 2024 04:25:50