“There is an ‘Add to Cart’ button for all products except for grouped products, which makes this section appear incomplete. Is there any option to include a button for grouped products as well?”
Please refer the screenshots :
1) https://snipboard.io/mINzkO.jpg
2) https://snipboard.io/5FEqwx.jpg
3) https://snipboard.io/BG5bPa.jpg