I believe the website, by default, only allows inputting new lines. However, you can add a break line by copying it from elsewhere. While TCM displays both new lines and break lines (outside the editor), it doesn’t allow entering a new line directly because the text editor is based on a third-party package that doesn’t distinguish between new lines and break lines, as HTML is not its targeted output format. As a result, all newlines are converted to break lines.

I am considering adding an optional feature (enabled by default) that converts a single 'Enter' press into a new line and two consecutive 'Enter' presses into a line break.

Apologies if this is confusing. I wish TC had used a different format.