Some instructions for anyone interested: 1) The waterfall column is rendered here https://searchfox.org/mozilla-central/rev/4fbcfe6fecf75d7b828fbebda79a31385f7eab5f/devtools/client/netmonitor/src/components/RequestListItem.js#326 2) It's rendered only if visible i.e. if `columns.waterfall` is true 3) There condition should be extended to also check state of the sidebar Something like: `columns.waterfall && sideClosed` 4) The state of the sidebar visibility is stored in the UI reducer https://searchfox.org/mozilla-central/rev/4fbcfe6fecf75d7b828fbebda79a31385f7eab5f/devtools/client/netmonitor/src/reducers/ui.js#75 5) The way how to get access to the state is visible e.g. here https://searchfox.org/mozilla-central/rev/4fbcfe6fecf75d7b828fbebda79a31385f7eab5f/devtools/client/netmonitor/src/components/RequestListContent.js#404 So, we should pass the `networkDetailsOpen` into the `RequestListItem` as a prop somewhere here https://searchfox.org/mozilla-central/rev/4fbcfe6fecf75d7b828fbebda79a31385f7eab5f/devtools/client/netmonitor/src/components/RequestListContent.js#374-392 Honza
Bug 1566527 Comment 3 Edit History
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Some instructions for anyone interested: 1) The waterfall column is rendered here https://searchfox.org/mozilla-central/rev/4fbcfe6fecf75d7b828fbebda79a31385f7eab5f/devtools/client/netmonitor/src/components/RequestListItem.js#326 2) It's rendered only if visible i.e. if `columns.waterfall` is true 3) There condition should be extended to also check state of the sidebar Something like: `columns.waterfall && sideClosed` 4) The state of the sidebar visibility is stored in the UI reducer https://searchfox.org/mozilla-central/rev/4fbcfe6fecf75d7b828fbebda79a31385f7eab5f/devtools/client/netmonitor/src/reducers/ui.js#75 5) The state is accessed here https://searchfox.org/mozilla-central/rev/4fbcfe6fecf75d7b828fbebda79a31385f7eab5f/devtools/client/netmonitor/src/components/RequestListContent.js#404 So, we should pass the `networkDetailsOpen` into the `RequestListItem` as a prop somewhere here https://searchfox.org/mozilla-central/rev/4fbcfe6fecf75d7b828fbebda79a31385f7eab5f/devtools/client/netmonitor/src/components/RequestListContent.js#374-392 Honza