I have created a new tag in the Launch and build it properly for dev environment which shows a green color. However, the tag was not visible on the network panel whereas it was visible on the console panel showing "tag fired".
Please help in viewing the tag on the network panel.
Some more details would be necessary to troubleshoot your situation - it is often the case that a Launch rule won't produce any new entries in the Network panel of your browser (for example - an Adobe Analytics 'Set Variables' action).
Can you tell us more about the rule you've created and what your intention with it is?