Shims and proper leveling avert gaps and be sure soft operation
https://flint-potassium-85d.notion.site/Be-mindful-of-building-codes-and-egress-requirements-for-bedroom-windows-3b0c80af8a5f805a8dabf620a2f447f5
Shims and right leveling save you gaps and verify clean operation. Uneven install can cause binding, drafts, or untimely wear of hardware.