Is it possible to create one grid and add this grid on different places on my website for example on my home-page and my contact-page? Because know it says "no posts found" on one of those two pages. Or do I need to create the grid again for every single place I want to place it?
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No, you can use anywhere same post grid, you don't need to create multiple time to use on multiple places, Please show me the issue where the "no posts found" issue is happening, i will check why this is happening.