What you can try doing is to set up auto tags on away activities like "Away", "Session lock", "Power off" and maybe some other if you run into it. After that you can transfer auto tags to tags for any time range for example for an entire month in just a few clicks. This is especially useful if you're not using auto tags already.

I completely agree with you. There should be an option in "Untagged Time" to exclude Idle and Session Locked time ..

My current workaround is to go into EACH day, select "Away", highlight all occurrences, and then apply a standard "Filler" tag

For my part I also need "session lock" to not be considered as active.
For example, If my fisrt activity is at 8 am and my last at 5pm with a lunch hour "session lock", it actually show 8 tagged hours out of 9 active hour.
an option to consider "only Active", "active and away" or "active+away+lock" should be added.

Also, as suggested above, having bars based on targed would be a major improvement for me. We are working with "2 weeks period" and all our target are based on 2 weeks. (pay, sprints, and hours to work within those 2 weeks)
Having it by week could also be fine to achive my purpose, but having cutomized period would be much appreciated.

I love the new "Untagged Time" tab. I think one small improvement could make it more useful. It is currently based on a percentage of active time, but on days when I am away from my desk or if manic time was not running, it would appear to have been fully tagged for the day when it really wasn't. Feature: could the bars be based on a percent of a set number of hours or have a horizontal line indicating the set number of hours? Additionally, could the goal be easily adjustable or set by the calendar month, as my goal changes throughout the year and project.