@Bettina Martin - I see what you mean - it is tricky. I assume the add button/plus symbol is related to a Table.

You could try a click-and-drag so that your cursor/selection just touches the item you are trying to select:

That is too bad. It is an ok workaround but I am using quite a few roadmap tables that feed into a larger roadmap and it makes arranging elements real hard, especially because highlighting and dragging boards is already cumbersome in Miro (there is no feature that locks board element selection but still allows moving the board either). Thank you for the suggestion.