Howdy cristobalwong,
Thanks for updating us with this information!
Let's confirm what is selected as the "Start after" preference to determine how much time should pass before the Screen Saver should appear. For easy finding, you'd want to choose Apple menu > System Preferences, click Desktop & Screen Saver, then click Screen Saver. In addition to checking this, are you able to click Preview on the Screen Saver to see if that pops up and displays the selected option? You can find additional information on this via the following resource. The information below covers the "Start after" preference, which is found here: Change Screen Saver preferences on Mac
Click the “Start after” pop-up menu, then choose how long your Mac can be inactive before the screen saver starts. If you don’t want a screen saver to start, choose Never.
Be sure you don't have Never selected, and adjust it to 1 minute to test this quicker on your end. If this still isn't working, is this a personal computer, or is it managed by an educational institution or workplace?
We hope this helps.
Have a great day!