I don’t want to see the heart rate graph on the main screen of my iWatch. It started showing after the last update.

Hey there Oldsoftballman,

Upon researching this, we didn't find a direct way to remove a complication, but the same steps to edit complications can be found under the section 'Add complications to the watch face' in this link: Customize the watch face

If you need more help, we recommend reaching out to Apple Support as they'll be in the best position to assist further with this: Get Support

Cheers.