fixing indentation

.github/workflows/explorer_preview.yml

@@ -12,12 +12,11 @@ jobs:
        - uses: actions/checkout@v2
          with:
           ref: ${{ github.event.pull_request.head.sha }}
-       -  uses: actions/setup-node@v2
-          with:
+       - uses: actions/setup-node@v2
+         with:
            node-version: '14'
            cache: 'npm'
            cache-dependency-path: explorer/package-lock.json
-       - run: cd ./explorer
        - run: npm i -g npm@7
        - run: npm ci
        - run: npm run format