After I bought and installed the DLC, why did all the dirt blocks on the left get replaced? How can I import the DLC without deleting the original dirt blocks that came with the program?
Have you checked the tilesets yet?
The tile palette on the left shows whatever Tileset is assigned to the map you currently have selected, so switching maps swaps the whole palette. Nothing gets removed from the project by that.
The title bar in your screenshot says MVT samplemap, so I’m wondering if that’s the sample project that ships with the DLC rather than your own project. That one has its own Tileset entries pointing at the DLC images, which would explain the different tiles.
If you did bring the DLC into your own project, can you open Database → Tilesets (like @Rifleman_XM8 mentioned) and check the entry your map is using? If the DLC images got dropped into the image slots of a Tileset you were already using, that would overwrite what the map draws from. Making a new Tileset entry and putting the DLC images on that one instead leaves the original entry alone, then each map picks which one it wants in Map Properties.
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