For others who might be reading this, I'll describe the 4.x behavior:

• DM 4.1: the trash icon only appears if there is not a build is progress
• DM 4.2 - 4.5: the trash icon only appears if you have authorization (regardless if there is a build in progress)
• DM 4.6: the trash icon only appears if you have authorization; it is disabled if there is a build in progress

So, if it is not there, it suggests that you don't have authorization. Have a look at Users > People and see what role you have. Then go to Users > Roles and privileges and click on "View all" for the role you have. For the Pipeline column, you should see Create, Edit, Delete

Also, as a person with zoom turned on an OS level, I see a left-right scrollbar. You might need to scroll to the right to see the trash can depending upon your monitor, etc.