Greasy Fork is available in English.
It preserves YouTube's progress bar always visible even if the controls are hidden.
< Feedback em YouTube ProgressBar Preserver
Okay, could you describe the browser and the script engine you use?
Like: Chrome + Tampermonkey
And version numbers will help me more.
Like: Chrome 83.0.4103.116 + Tampermonkey v4.10
It's not working