CustomizedApp.jsx

 <div className="sendbird-app__channellist-wrap">
    <h1 className="server-headline">{lowerCaseServerName}</h1>
       <div className="private-channel-list">
            <SBChannelList
                onChannelSelect={(channel) => {
                  if (channel && channel.url) {                                 
                      setCurrentChannel(channel);                
                  } 
                }}                           
              renderChannelPreview={                               
                customizedPreviewItem
                ? ({ channel, onLeaveChannel }) => (
                   <CustomizedChannelPreviewItem
                      userId={userId}
                      channel={channel}
                      onLeaveChannel={onLeaveChannel}
                      currentChannelUrl={currentChannelUrl}                                        
                   />                                 
                  )
                : null
              }
            /> 
     </div>
     <div className="community-app">
         <div className="community-channel-list">
             <CommunityChannelList
                userId={userId}
                appId={appId}
                currentChannelUrl={currentChannelUrl}
                setCurrentChannel={setCurrentChannel}
             /> 
         </div>
    </div>
 </div>