adds env variable for non-multichain use

.env.sample

@@ -8,3 +8,4 @@ NEXT_PUBLIC_CHAIN_ID=cosmoshub-4
 NEXT_PUBLIC_ADDRESS_PREFIX=cosmos
 NEXT_PUBLIC_EXPLORER_LINK_TX="https://www.mintscan.io/cosmos/txs/\${txHash}"
 NEXT_PUBLIC_CHAIN_DISPLAY_NAME="Cosmos Hub"
+NEXT_PUBLIC_MULTICHAIN=true

pages/_app.js

@@ -5,7 +5,7 @@ import ChainSelect from "../components/chainSelect/ChainSelect";
 function MultisigApp({ Component, pageProps }) {
   return (
     <AppWrapper>
-      <ChainSelect />
+      {process.env.NEXT_PUBLIC_MULTICHAIN && <ChainSelect />}
       <Component {...pageProps} />
     </AppWrapper>
   );