i update everything but the same results :( i cannot put the resolution higher. My monitor is ACER K272HUL if help you.
Thank you for the update and additional information. Let's try the troubleshooting steps in this link. Also, try plugging your external monitor directly to your Surface and see if you experience the same issue.
If after these troubleshooting and the resolution issue is still noticed, we suggest that you contact our Surface Answer Desk team for further assistance.