[Tex/LaTex] How to change subcaption font size in Lyx

fontslyxsubcaptionsubfloats

I want to set the font for captions and sub-captions in my Lyx document to 'large'. There is no issues with changing size of captions, but I can't change sub-captions. Here are the preambles I try to use and the errors I get. The errors are not caused by 'caption' package. Here are two preambles that I tried to use.

With subfigure package:

\usepackage[large]{subfigure}
\usepackage[margin=10pt,font=large,labelfont=bf, labelsep=endash]{caption}

With subcaption package:

\usepackage[font+=large]{subcaption}
\usepackage[margin=10pt,font=large,labelfont=bf, labelsep=endash]{caption}

In both cases I receive following errors:

\begin{document}

The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

 \subfloat
               [ ---    ]{\begin{centering}
Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.

Lyx MWE can be downloaded here.

LaTex verson (I used Lyx option Export-> LaTeX(plain) to create it) can be downloaded here.

Best Answer

The error message you show in your question comes from not loading subfig, as it is subfig that defines \subfloat. Adding font=large as an option to subfig should work (requires the caption package as well, I think), i.e.

\usepackage[font=large]{subfig}

And of course, remove the subfigure package from the preamble.

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