R Presentation中的列布局

Question

我想在R演示文稿中的幻灯片上有两列，在全宽段落之后使用列分割，但我只能得到这个：

我希望“冰淇淋”部分占据幻灯片的整个宽度，“Ben's Ice Cream Palace”和“Jerry's Ice Cream Castle”部分在下面相邻。更改部分标题的级别似乎没有任何影响。有没有办法做到这一点？

Troubleshooting
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## Ice Cream

My town has two ice-cream parlours, Ben's Ice Cream Palace and Jerry's Ice Cream Castle. It would be nice to show the two establishments' flavours side-by-side so that we could compare them easily when deciding where to go buy ice cream on a hot sunny day.

### Ben's Ice Cream Palace
- Chocolate
- Vanilla
- Neopolitan
- Rum Raisin
- Butter Pecan
- Mint Chocolate Chip

***

### Jerry's Ice Cream Castle
- Chocolate
- Vanilla
- Strawberry
- Chunky Monkey
- Chocolate Chip Cookie Dough