Data Grid nav buttons are not visible

Hi All,   I have a problem with all the Data Grids in my application. The navigation buttons don't show when the project is running.   These are the buttons in structure mode : In design mode:   but in run mode, the arrows disappear: When I inspect the page in run mode, the buttons are there, but hidden. I don't understand why I get this behavior.   Do you know what is going on?   Thank you
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