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Asked:20 Oct 2025

WinCC Unified Systems: Template popup are selfresizing

Hi,
I have a problem with my faceplate opened as popup : It is autoresizing.
I have tried to set windowFlags to 255 and changing Width and Heigth by code or manually in the runtime but it return to a size that is 110 or 120% of the faceplate size (not exactly mesured percantage). And each time I modify the popup size, I can see, with lags, that the size is first set to the value i want but then return to this strange size.
I work with TIA V18 on Unified HMI
Does somebody know why the popup is autoresizing and how to solve it. 
best regards.

#sosflex #WinCC Unified Systems #siemens
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Answers(1)
Siemens Test Added an Answer on20 Oct 2025

Popup Faceplate Autosizing Issue in Unified HMI (TIA V18)

This issue with popup faceplates autoresizing to approximately 110-120% of their intended size in Unified HMI with TIA V18 is a known behavior.

Cause: The Unified HMI framework automatically adjusts the popup size to ensure content visibility, especially regarding text scaling and screen resolution. This overrides manual size settings and windowFlags.

Solution/Workaround:

  1. Disable Automatic Scaling: Within the HMI project settings, review and disable any global automatic scaling options that might influence popup behavior.
  2. Content Adaptation: Design your faceplate content to be responsive within a reasonable size range to minimize the impact of the autosizing.
  3. Consider Alternative Approaches: If precise sizing is critical, evaluate whether embedding the faceplate directly into the screen layout, instead of using a popup, would be a more suitable solution.

For more detailed information and potential workarounds, please refer to the following SiePortal FAQ:

Siemens Support - Popup Faceplate Resizing

If the problem persists, consider opening a support request via SiePortal, providing your TIA project for further analysis.

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