# How do I adjust the width of Beamer's footnote “area”?

I have a Beamer template with a vertical "ToC bar" along the right side. I have the problem that when I insert footnote citations (e.g. biblatex' \footfullcite), the resulting footnote protrudes into the ToC bar on the right. This leads me to suspect that footnotes are typeset in a different "area" of a frame than the main content (since the main frame content does not "invade" the navigation bar). How do I adjust the width of this footnote area so that long footnotes do not protrude into the ToC bar on the right?

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Using the Goettingen theme (which features a sidebar on the right), footnotes don't protrude into the the sidebar, so you'll have to add a minimal working example (MWE) that illustrates your problem. –  lockstep Jan 30 '13 at 9:11
Note that the vertical positioning of footnotes is problematic; see tex.stackexchange.com/questions/5852/… –  lockstep Jan 30 '13 at 9:14
A minimal working example involves a full beamer template - this one: kom.aau.dk/~jkn/latex/latex.php#beamer_aausidebar. Can I expect people to want to install that to check my example? –  Thomas Arildsen Jan 30 '13 at 11:23
Thanks lockstep, that post on the vertical positioning seems related. It looks like I might be able to use that \addtobeamertemplate command to tweak it, but I don't know how to reduce the available horizontal space there. Maybe I could just redefine the footnote template to contain a sufficiently narrow minipage, but I guess that is a pretty dirty hack... –  Thomas Arildsen Jan 30 '13 at 11:28

OK, I seem to have found a solution that works, but I still think it might be a dirty hack... Inspired by lockstep's question cited in the comments, I gambled that this could be done using \addtobeamertemplate{footnote}.

I poked around Beamer's basic definitions and found \newcommand<>\beamer@framefootnotetext[1]{... in beamerbaseframecomponents.sty where I found \hsize0.85\paperwidth which seems to define the footnote "area" width.

So, I came up with the following solution: