Hi, Matthew. I'm sorry you're feeling frustrated by the level of formatting control. We work hard to make sure the courses you create with Rise 360 look great on any device. Part of that is providing default formatting for each block.
At the same time, I totally understand that our formatting isn't a perfect fit for every project. One cool trick you can use is to adjust the block settings to meet a particular set of brand guidelines, then create a block template from that block to reuse later. That way, you don't have to keep reapplying formatting options. You can read more about block templates here.
Back to your original query, there is a way to select the content of multiple cells! Simply select the text in the first cell that you want to edit, then press Shift+Down Arrow or Shift+Right Arrow to select additional cells.
Hope that helps! Let me know if there's anything else I can do for you.
Thanks, Wendy! I had not seen the FAQ section (below the feature overview) for this feature until now.