Even if I adjust the opacity and save it, it goes back to 100%.

Hi @User! Thank you for reporting the bug.

I suggest you clear the cache and data on the Forex Tester Online main page.

Here’s how to do it in Chrome: ‍ ‍

‍Open the FTO website in Chrome.
Click the lock icon in the address bar (to the left of the URL).
Select Site settings from the dropdown menu.
Scroll down and click Clear data.
Reload the page. ‍ ‍

‍This may help resolve the issue.