$ snap list insomnia
Name Version Rev Tracking Publisher Notes
insomnia 6.0.0 17 stable gschier1990 -
$ cat /etc/os-release
NAME="Ubuntu"
VERSION="18.04.1 LTS (Bionic Beaver)"
The filter response body line (lower right corner) is too small, so the upper part of the filter string is cut.
I haven't find a way to resize it.

Same happens with Search in response

So probably all inputs then? I think it may be related to the font used on Ubuntu
Havent been able to replicate it in other inputs just these two.
Can confirm its something to do with the font.

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I don't know when, but the issue disappeared
$ snap list insomnia
Name Version Rev Tracking Publisher Notes
insomnia 6.0.2 19 stable gschier1990 -
$ cat /etc/rel
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.10
Most helpful comment
So probably all inputs then? I think it may be related to the font used on Ubuntu