config unusable 4k monitor

[whitis]

imwheel -c is totally unusable on a 50" 4K/UHD monitor. The buttons are tiny and illegible. The preview is tiny.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: imwheel 1.0.0pre12-12
ProcVersionSignature: Ubuntu 5.4.0-53.59~18.04.1-generic 5.4.65
Uname: Linux 5.4.0-53-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Dec 1 01:37:41 2020
InstallationDate: Installed on 2019-05-02 (578 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: imwheel
UpgradeStatus: No upgrade log present (probably fresh install)