What is your operating system?
Windows 10 64-bit Pro
What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
Version 21.01.29
Can you repeat the problem? If so, what are the steps?
(Please be specific and use the names as seen in Shotcut, preferably English. Include a screenshot or screen recording if you can. Also, you can attach logs from either View > Application Log or right-click a job and choose View Log.)
After upgrading from version 20.11.28 to 21.01.29 , Can not edit the LUFS on number field , it can be done in version 20.11.28.
I have just upgraded and I can also replicate this issue.
As a workaround, hover over the LUF value and use the mouse scroll wheel or left mouse click on the Target Loudness indicator and drag left/right to the desired value.
The field rejects values outside of the valid range (-50.0 to -10.0). This can make it difficult to edit. I have made some changes for the next release so the field is less aggressive in rejecting values.