felp is a short of functional help, and provides
fuzzyhelp function or “Fuzzy Search on R Help” RStudio Addin?. pseudo-postfix operator to simultaneously display a help document and a structure of an object?p pseudo-postfix operator to display document of a package
install.packages("felp")
source("https://install-github.me/atusy/felp")with felp::fuzzyhelp() or “Fuzzy Search on R Help” RStudio Addin:

This feature is a https://shiny.posit.co/ app and is also available online at https://atusy.shinyapps.io/fuzzyhelp/. Note that some features are disabled in the online version (e.g., links between help topics and syntax highlights). Also, the online version has a limit on the number of available packages (tidyverse + felp).
There is also a similar project at https://helpr.atusy.net/ based on WebR. The main differences are appearance and the number of available packages. WebR-based project supports installing any package on CRAN. Once you type {{ packageName }}:: (e.g., dplyr::), WebR installs the package and you can find help topics in the package (e.g., dplyr::mutate).