我在 VS Code 用 blogdown 已经几个月了，之前可以在预览界面右键弹出菜单来复制。刚刚试了下，右击弹不出菜单了，但是按 Ctrl + C 快捷键可以复制。要是你实在复制不了，可以用浏览器打开预览画面，在浏览器复制。
这是我的运行环境信息：
+> sessionInfo()
R version 4.1.3 (2022-03-10)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Arch Linux
Matrix products: default
BLAS: /usr/lib/libblas.so.3.10.0
LAPACK: /usr/lib/liblapack.so.3.10.0
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.1.3 magrittr_2.0.1 R6_2.5.1 bookdown_0.24
[5] promises_1.2.0.1 later_1.3.0 tools_4.1.3 rstudioapi_0.13
[9] yaml_2.2.1 Rcpp_1.0.7 blogdown_1.6 knitr_1.36
[13] xfun_0.28 jsonlite_1.7.2 httpuv_1.6.3 rlang_0.4.12
[17] servr_0.24
Version: 1.65.2
Commit: c722ca6c7eed3d7987c0d5c3df5c45f6b15e77d1
Date: 2022-03-10T15:36:26.048Z
Electron: 13.5.2
Chromium: 91.0.4472.164
Node.js: 14.16.0
V8: 9.1.269.39-electron.0
OS: Linux x64 5.16.15-zen1-1-zen
