All the columns are user resizable in the Tags window of Layout. So it seems it’s quite possible.
It’s worth noting that there are two separate problems here. The columns have never been user resizable by dragging the column divider in the header: they should be.
The second problem is that the names column ceased resizing automatically to take up any extra room available. This bug was introduced in the latest update of 21. There may be a fix for this as described in this and several other threads, but it involves tinkering with some buried settings that may be a bit dangerous, and has not worked consistently for everyone.