Apologies for keeping you hanging! The easy solution of opening in a new tab or window is in the Assignment Settings. In the "Submission Type" area, select the "Load This Tool In A New Tab" checkbox. You can still include the typical assignment instructions in the text editor above, but students will be presented with a button to launch the SCORM in its own window. They'll need to allow popups for Canvas to see it.
The more advanced option would require an admin to add some basic CSS to your theme. By default, it looks like Canvas limits the overall application width to 1366px. Something like the following will extend that setting to something a bit more realistic, for example:
body:not(.full-width):not(.outcomes) #wrapper.ic-Layout-wrapper {
max-width:1800px;
}
Notice there are a couple of exceptions applied to the setting, specifically for pages intended to run full-width, like Speedgrader and Outcomes.
After we did this at my organization for some subaccounts, we also didn't like how SCORM that we do want to load on the assignment page looked, so we adjusted the height on the iframe in that case:
body.assignments iframe.tool_launch {
height: auto!important;
min-height: 600px!important;
}