confirmation window will not resize

[Galen Thurber]

window requests action: Settings, Remind Later, Install now
but window is not resizable
nor are the columns

expecting window to be resizable in order to read technical notes, version number, package info etc..

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: update-manager 1:16.04.15
ProcVersionSignature: Ubuntu 4.4.0-116.140-lowlatency 4.4.98
Uname: Linux 4.4.0-116-lowlatency x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: XFCE
Date: Thu Mar 28 08:35:21 2019
InstallationDate: Installed on 2016-07-26 (974 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)