Steps to reproduce:
- have an open project
- switch to Projects -> Build or Run configuration (if available)
- Preferences ( == Tools->Options) -> Build & Run -> Kits -> select a kit
The Details buttons look a bit strange now - don't know when this changed or whether this might be related to the used Qt version..
Having locally only some older builds and builds using an older Qt (5.6-5.9) than the Qt used to build the beta snapshots [see the attached screenshots of the 'expected' and the 'strange' looking Details button.