not sure what you mean exactly - by inserting a Text you can edit the font size right then or afterwards right click on chart - objects - text - and go from there.
to thicken or thinnen lines you do the same - right click on chart - objects - choose horizontal/vertical line and in the bottom right you can choose how thick lines should be...
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Hello
some help on how to increase font size? in chart horizantile and vertical line
Regards
S Naidu