In a DXA 2.0+ setup on Sites 9.0, I believe (in upgrade scenarios) you might still find the older-style region templates, which have a Region (View) Name set in their metadata and possibly a hint in their name (square brackets by convention such as "Teaser [2-column]").
- Assuming you're using the Sites 9.0 "native" regions feature, are these older-style templates still okay to use?
- If not used, is it safe to delete the templates meant for regions from
Building Blocks > Modules > Core > Editor > Templates?
- Is there a problem if case editors mix old and new style templates? The older-style region templates still seem to work.
Edit (2019-05-23): I noted the square brackets in Template names are by convention and that the Region Name metadata field actually identifies these older-style region Templates.