Codefolding is provided through the highlighter.
Currently the following highlighters provide folding:
pascal, lfm, diff, xml, html
If you need folding for a different language, then you would have to write a new highlighter.
To use a highligher, select it from the components, drop on the form, and then change
property SynEdit.Highlighter
to the highlighter you want.
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As for folding configuration:
There are some options for configuration.
Look at the settings in the IDE "Environment" menu / "options".
It shows you what can be configured.
Mainly switching folding on/off for individual block types (like begin/end or class/end or try/except,....).
In order to configure folding in your project, you need to write some code.
It can not be done through the designer.
Please have a look at the testcase that comes with synedit:
components\synedit\test\SynTest.lpr
particularly the file: testhighlightpas.pas
the method TTestBaseHighlighterPas.EnableFolds shows how to change fold-config.
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You can also look at the gutter, it has a part for code folding.
It allows configuration of how the mouse works (ask for more details if you need this,it's complex).
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This may not answer all your questions. But a lot of the answer depends on more detail of what you want to do exactly.
You can try out some bits, by using a Pascal highlighter. It has some folding enabled by default.
Then you can play with the code from the testcase, and try to enable/disable it.
Otherwise please write exact details of what you need.
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As for writing your own highlighter (if you need a language that is not yet supported):
this is the starting point
http://wiki.lazarus.freepascal.org/SynEdit_Highlighter
(see links at bottom too)
also see the very few entries in fpdoc (in synedit folder)
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