Embed a larger Lucidchart diagram in Hudu without clicking full screen.

Embedded a diagram from Lucidchart, but when it displays in Hudu, it only takes up a quarter of the screen. Can you make it bigger in Hudu with out clicking the fullsize button? I've already selected the largest size within Lucidchart, but I can't find any setting within Hudu to make it full size within the designated box area.