What is your operating system?
Linux Ubuntu Studio 20.10 (Plasma Desktop)
What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
version 21.03.21 - 64 bits
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.)
I changed the cursor size for better visualization of the cursor.
The cursor size becomes small inside Shotcut, except in a particular area of the loudness meter.
Attached is a video showing the problem.