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Naveen DhanarajNaveen Dhanaraj 

side bar in developer console is not visible to me in lightning ...while writing codes

BALAJI CHBALAJI CH
Hi Naveen,

I'm aware that this is a old question but still a Unsolved question. So, here is a answer that might helpful to you.

The standard Salesforce Classic header and sidebar are always suppressed for pages when they’re displayed in Lightning Experience. In particular, the showHeader and showSidebar attributes of <apex:page> have no effect on Visualforce pages when displayed in Lightning Experience.
Please find below link for more information:
https://trailhead.salesforce.com/en/lex_dev_visualforce/lex_dev_visualforce_known_issues

Let me know if that helps you.

Best Regards,
BALAJI