The number of issues fetched per query is currently hardcoded.

For queries with a larger result set you have no option to pull more. It
would be nice to set the page size in the config, both globally and per tab.

maxResults: 75
issueTabs:
  - name: "All"
    jql: "project = {{.ProjectKey}} ORDER BY updated DESC"
    maxResults: 100

I have already implemented this and can open a PR.

The caveat is that more than 100 items are currently not possible with the
API used in lazyjira. The optimal solution would be to take advantage of the
cursor-based querying of the modern API. I already prototyped a python script
for my Jira tv channel and it works quite well.

But this would be another improvement for another PR.