From your web browser, press the F12 key (to open the DevTools panel of the web browser), then click here (1), then here (2):
Then, click on:
<div class="col-xs-4 col-xs-offset-8">
Change margin-left from 66.66% to 110%, press ENTER:
Then click on:
<div id="observations-map"
Change height from 550px to 1500px, press ENTER:
Press F12 to close the DevTools panel of the web browser.
Now you have a large map, with the observations panel on the right:
These changes apply only to this browser tab, until you leave the map or refresh the page (press F5 or click on the refresh button of the web browser). No risk.