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Issue Checklist

• I am using the latest version of NexT.
• I have read the relevant documents of Hexo and NexT.
• I have reviewed the latest Roadmap on GitHub and searched for current issues, which does not help me.

Expected behavior

Want to still display sidebar even clicks background.
點擊背景，希望側邊欄不要隱藏

Actual behavior

Sidebar hides when clicking background.
點擊背景，側邊欄會隱藏

Steps to reproduce the behavior

1. In _config.yml, set "scheme: Mist".
2. In _config.yml, set "display: always".
3. run "hexo s", when clicking background(except article, header or bottom area), sidebar will hide.

• 在_config.yml, 設定 "scheme: Mist".
• 在_config.yml, 設定 "display: always".
• 執行 "hexo s"，當點擊背景區域(不包含文章、頁首和頁尾區域)，側邊欄會隱藏起來。

Environment Information

Node.js and NPM Information

node v10.16.0
npm 6.9.0

Package dependencies Information

+-- hexo@4.2.0
+-- hexo-admin@2.3.0
+-- hexo-deployer-git@2.1.0
+-- hexo-generator-archive@1.0.0
+-- hexo-generator-category@1.0.0
+-- hexo-generator-index@1.0.0
+-- hexo-generator-searchdb@1.3.0
+-- hexo-generator-sitemap@2.0.0
+-- hexo-generator-tag@1.0.0
+-- hexo-renderer-ejs@1.0.0
+-- hexo-renderer-marked@2.0.0
+-- hexo-renderer-stylus@1.1.0
+-- hexo-server@1.0.0
`-- hexo-symbols-count-time@0.7.1

NexT Configuration

# ---------------------------------------------------------------
# Scheme Settings
# ---------------------------------------------------------------
# Schemes
#scheme: Muse
scheme: Mist
#scheme: Pisces
#scheme: Gemini

# ---------------------------------------------------------------
# Sidebar Settings
# See: https://theme-next.org/docs/theme-settings/sidebar
# ---------------------------------------------------------------
  # Sidebar Display (only for Muse | Mist), available values:
  #  - post    expand on posts automatically. Default.
  #  - always  expand for all pages automatically.
  #  - hide    expand only when click on the sidebar toggle icon.
  #  - remove  totally remove sidebar including sidebar toggle.
  display: always

Other Information

It seems not to happen in Next 6.4.0 version that I installed before. Or is there any config settings can solve the problem? Thanks.
因為我之前在Next 6.4.0版本沒這個問題，是有哪裡可以設定不要隱藏嗎？謝謝。