When your application is running on a controller or as a simulation and you open a programming object in the development system, the current values are displayed there. This allows you to monitor the runtime behavior of the POU.
There you can disable the inline monitoring function:
“Tools Options”, in the “Text editor” category, on the “Monitoring” tab
For more information see: ⮫ CODESYS Essentials: Monitoring of values
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Display in networks
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Display in LD
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Display in IL