How to hide the title bar of the application's window?

[Febtw]

I'm trying to use docker-baseimage-gui to built a docker image about freeplane. the main-window-selection.jwmrc is

<Type>normal</Type>
<Name>Freeplane</Name>
<WmName>Freeplane</WmName>

I have tried to add a line <Option>notitle</Option>, but there's no change on the window. I don't make the title bar of the window hide, or notitle option appear in the right-click menu.

I build my image based on this project which is using docker-baseimage-gui too. My Dockerfile is

FROM jlesage/baseimage-gui:debian-10-v4.2.2

ARG FREEPLANE_VER=1.10.6u1

ENV APP_NAME="Freeplane"
ENV NOVNC_LANGUAGE="zh_Hans"
ENV TZ=Asia/Shanghai
ENV HOME=/config
ENV LC_ALL=C

COPY root /
COPY startapp.sh /startapp.sh

RUN apt-get update \
&& apt-get install -y wget libnss3 libxss1 desktop-file-utils libasound2 ttf-wqy-zenhei libgtk-3-0 libgbm1 libnotify4 xdg-utils libsecret-common libsecret-1-0 libindicator3-7 libdbusmenu-glib4 libdbusmenu-gtk3-4 libappindicator3-1 procps \
&& chmod 755 -R /etc/cont-init.d \
&& chmod 755 -R /etc/jwm \
&& chmod 755 -R /opt \
&& chmod 755 /startapp.sh \
&& wget https://nchc.dl.sourceforge.net/project/freeplane/freeplane%20stable/freeplane_${FREEPLANE_VER}~upstream-1_all.deb \
&& apt-get install -y openjdk-11-jdk \
&& dpkg -i freeplane_${FREEPLANE_VER}~upstream-1_all.deb \
&& rm  freeplane_${FREEPLANE_VER}~upstream-1_all.deb \
&& install_app_icon.sh "https://icon-icons.com/downloadimage.php?id=94490&root=1381/PNG/128/&file=freeplane_94490.png" \
#fix window decorations
&& sed -i 's/normal/desktop/g' /opt/base/etc/jwm/main-window-group.sh \
#novnc_language
&& mv /opt/noVNC/index.html /opt/noVNC/index.html.en \
#fix dpkg
&& sed -i '/messagebus/d' /var/lib/dpkg/statoverride

The startapp.sh has only one command /usr/bin/freeplane %F to open freeplane.

[Febtw]

I tried v4.3.6, the title bar is hidden well.