There's 2 ways to select alternative words or phrases in DeepL Write. Here's how:
For short texts you can find them directly under your improved text.
For longer texts just click on a word you wish to change.
A drop down menu will appear with the option to Rephrase sentence or Replace word.
Choose your preferred alternative from the drop-down list.
Remember that alternatives for whole sentences are only available for English and German for DeepL Write.