Grafana-Kiosk displays top line in browser

Dear all,
I am using grafana-kiosk on a Raspberry Pi and all is great, besides the fact that there is a top bar saying “You are using an unsupported command-line flag: --no-sandbox. Stability and security will suffer.”
As I have no mouse attached I do not know how to get rid of it.

Any ideas?

What is the release of the OS on your pi? Also - what version of chromium?

I’m not getting this popup/notification on mine, but i’ll update again and check.

here’s my /etc/os-release

PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
VERSION_CODENAME=stretch
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

and dpkg -l | grep chromium

ii  chromium-browser                      72.0.3626.121-0+rpt4              armhf        Chromium web browser, open-source version of Chrome
ii  chromium-browser-l10n                 72.0.3626.121-0+rpt4              all          chromium-browser language packages
ii  chromium-codecs-ffmpeg-extra          72.0.3626.121-0+rpt4              armhf        Extra ffmpeg codecs for the Chromium Browser
ii  rpi-chromium-mods                     20190613                          armhf        Raspberry Pi-specific mods to Chromium

Hello,
thanks for your reply. This is my /etc/os-release

PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
NAME="Raspbian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

These are the installed chromium packages

ii  chromium-browser                     74.0.3729.157-rpt5                  armhf        Chromium web browser, open-source version of Chrome
ii  chromium-browser-l10n                74.0.3729.157-rpt5                  all          chromium-browser language packages
ii  chromium-codecs-ffmpeg-extra         74.0.3729.157-rpt5                  armhf        Extra ffmpeg codecs for the Chromium Browser