ubiquity confirmation window off partially offscreen

Two QA-test installs of Lubuntu 18.04.5 daily. (amd64 & i386)
hp dx6120mt (mini-tower, pentium 4 dual core, 3gb, winfast clone of nvidia 7600gt)
dell [optiplex] 755 (c2d-e8300, 8gb, amd/ati radeon rv610/radeon hd2400 pro/xt)

Using the Manual Partitioning option, after making up my partitions (/ and /home) a confirmation dialog box appears on screen, however it's not fully on-screen.

(a like message also appeared during install-alongside somewhat off screen too)

--
Do you want to return to the partitioner?
The file system on /dev/sda1 assigned to / has not been marked for formatting. Directories containing file system files (/etc, /lib, /usr, /var, ...) that already exist under any defined mountpoint will be deleted during the install.
Please ensure that you backed up any critical data before installing.
--
Write the changes to disk?
If you continue, the changes below will be written to disks. Otherwise, you will be able to make furher changes...

The partition tables of the following devices are changed:
 SCSI4 (0,0,0) (sda)

The following partitions are going to be formatted
 partition #5 of SCSI4 (0,0,0) (sda) as ext4
--

On one box it was only partially visible (single monitor, left of dialog box was on screen). On one box both screens were mirrored at boot so the same two portions were visible (photo to be uploaded in later comment #5)

On this box with two displays, the right side of the dialog box was visible on the second monitor.

Minor importance though, as on three+ boxes I could grab & drag dialog box so it was fully visible

(I got the feeling the dialog box was centering on my cursor, which wasn't a good idea as the cursor was near the bottom right of the screen as that was where I last clicked NEXT)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.15
ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CasperVersion: 1.394.3
CurrentDesktop: LXDE
Date: Sun Aug 9 17:10:36 2020
InstallCmdLine: file=/cdrom/preseed/lubuntu.seed boot=casper initrd=/casper/initrd quiet splash ---
LiveMediaBuild: Lubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)