REVIEW: User ui fixes

https://issues.sonatype.org/browse/NEXUS-6807
https://issues.sonatype.org/browse/NEXUS-6808
https://issues.sonatype.org/browse/NEXUS-6825
https://issues.sonatype.org/browse/NX-703
Logged as tech-debt: https://issues.sonatype.org/browse/NX-708