I can not add a new layout to the Web Part in kentico 10
There is no change - simply switch to Layout tab when editing properties of a web part. (If you don't see the Layout tab, please resign macros -> System -> Macros -> Signatures)
Explain more what you've done and/or what the error is. Did you upgrade to 10 or just do a fresh install? Providing greater detail will help resolve your issue faster.
Display name , Code name and Description fields in the Firefox 50.0.2 browser will not display.
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