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The registry keys for adjusting window border thickness (including the resizable "grab" area) in Microsoft Windows are located under HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics. The primary values are:

BorderWidth: This controls the base border thickness. It's a REG_SZ value, typically set to a negative number (e.g., -15 for 1 pixel, -30 for 2 pixels, up to -750 for 50 pixels—the negative multiplier is based on -15 per pixel for compatibility with older DPI scaling). Positive values or 0 may result in thicker borders or default behavior.

PaddedBorderWidth: This adds extra padding around the border (also REG_SZ, often set to 0 for minimal thickness, or negative like -60 for 4 pixels of padding).

To modify:

1) Open Registry Editor (regedit.exe) as administrator.
2) Navigate to the path above.
3) Double-click the value (create it if missing as REG_SZ).
4) Enter the new value (e.g., -15 for thin borders).
5) Log off and back on, or restart Explorer.exe, for changes to take effect.

These apply system-wide, including to MDI child windows like in Sierra Chart, but results can vary in Windows 11 due to modern window rendering (e.g., borders may appear visually thin but with adjusted grab areas). Always back up the registry before editing, as incorrect changes can cause issues.