Solution
LabVIEW allows setting a minimum window size for its Front Panel window. To access these settings, follow these steps:
- In LabVIEW, go to File >> VI Properties.
- In the Category dropdown, select Window Size.
- You can now select the exact minimum Width and Height in pixels inside the Minimum Panel Size option. You can also set the minimum size to the current window size, in case you do not know the exact amount of pixels.

Setting the minimum panel size to 0 and 0 (Default) will let the user manually reduce the window size without restrictions.