I want to know how to turn off performance issue detectors (for example N+1 Queries), or how to find and filter those issues on the Issues page.

You can disable or tune most performance issue detectors per project in Project Settings → Performance, in the Performance Issues - Detector Threshold Settings card. Adjust thresholds or turn individual detectors off there. You need Project Admin (or equivalent) access:
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[Screenshot: Project Settings → Performance showing the Performance Issues - Detector Threshold Settings card with detector toggles and thresholds.]

To list performance issues for a project, search Issues with:

Endpoint Regression and Function Regression detectors are not available as self-serve toggles in that card. To deactivate those, contact Sentry support.

If you use AI Issue Detection, that is controlled separately on the same Project Settings → Performance page. See AI Detected Issues.

More detail: Performance Issues configuration.