Ability to set limit of items displayed before "Show more" is used

# Feature request

## Summary
In the Search Bar, 2nd level expand, Tcl has many commands. I would like all to display w/o a "Show more..." clickable to get the rest. Request config option to allow setting the threshold for "Show more..." (or number-at-a-time before next Show more prompt). Thanks!

从 Search Bar 的第二级展开开始，找到 Tcl 命令现有的 "Show more..." 行为。跟踪当前项目阈值的选择方式，然后使该阈值可配置，并验证在显示另一个提示符之前会出现请求数量的项目。

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