Easiest way to approach this, I would say, is to go directly into the html code and in the <table> tag, add an attribute of width:
<table width="100%">
of course, there will probably be many other attributes, and width may already be present. If it is, then just change whatever value is there to "100%"
To do this without going into the html, however, simply select the table, go to the properties window (either through the properties window on the right hand side of the IDE or right click the table and select 'properties') and set the width property to be 100%
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