After upgrading the VDA from VDA 1912 to VDA 2402, users may notice that the fonts and graphics are not fitting within the custom application UI. Issue is generally seen when the client display has high resolution. Setting the High DPI setting on the Citrix Workspace App for Windows to Yes, may help to some extent even though the font size may remain bigger than in the VDA 1912 platform.
Disabling DPI Scaling by creating the following registry key will resolve the problem with the custom application:
Key: HKLM\SOFTWARE\Citrix\Graphics
Name: EnableDpiSupport
Type: DWORD
Value: 0
Some 3rd party custom applications are not DPI aware and will not function as expected in a DPI Matched ICA Session. With VDA 2402, DPI Matching is enabled by default.
For more information on developing DPI Aware applications, please refer to https://learn.microsoft.com/en-us/windows/win32/hidpi/high-dpi-desktop-application-development-on-windows