You can use the run-name parameter to change the name of the run in the actions list:

Example of run-name

run-name: Deploy to ${{ inputs.deploy_target }} by @${{ github.actor }}

Be aware that, if you are using Github Enterprise server, this parameter was introduced in version 3.8.

You don't need the ${{ }} in this case, just using:

if: github.event_name == 'workflow_dispatch' && github.event.inputs.input1 != ''

Will work

name: Test 35 # Related to https://stackoverflow.com/questions/72379994/github-actions-check-empty-dispatch-input


on:
  workflow_dispatch:
    inputs:
      input1:
        description: first input
        required: false
        type: string
      input2:
        description: second input
        required: false
        type: string

jobs:
  jobA:
    runs-on: ubuntu-latest
    if: github.event_name == 'workflow_dispatch' && github.event.inputs.input1 != ''
    steps:
      - run: echo "Input 1 not empty"

  jobB:
    runs-on: ubuntu-latest
    if: github.event_name != 'workflow_dispatch' || github.event.inputs.input1 == ''
    steps:
      - run: echo "Input 1 is empty"