I followed the steps here,
git clone https://github.com/SWI-Prolog/swish
cd swish
git submodule update --init
make packs
sudo apt install npm nodejs
sudo npm i yarn -g
yarn
make src
sudo apt-get install imagemagick
sudo apt-get install graphviz
swipl run.pl
But in the browser on localhost:3050, I just see an empty page (with the cogwheel and the search bar). Did I miss something?